South Africa the Republic of South Africa, is the southernmost country in Africa. It is bounded to the south by 2,798 kilometres of coastline of Southern Africa stretching along the South Atlantic and Indian Oceans. South Africa is the largest country in Southern Africa and the 25th-largest country in the world by land area and, with over 57 million people, is the world's 24th-most populous nation, it is the southernmost country on the mainland of the Eastern Hemisphere. About 80 percent of South Africans are of Sub-Saharan African ancestry, divided among a variety of ethnic groups speaking different African languages, nine of which have official status; the remaining population consists of Africa's largest communities of European and multiracial ancestry. South Africa is a multiethnic society encompassing a wide variety of cultures and religions, its pluralistic makeup is reflected in the constitution's recognition of 11 official languages, the fourth highest number in the world. Two of these languages are of European origin: Afrikaans developed from Dutch and serves as the first language of most coloured and white South Africans.
The country is one of the few in Africa never to have had a coup d'état, regular elections have been held for a century. However, the vast majority of black South Africans were not enfranchised until 1994. During the 20th century, the black majority sought to recover its rights from the dominant white minority, with this struggle playing a large role in the country's recent history and politics; the National Party imposed apartheid in 1948. After a long and sometimes violent struggle by the African National Congress and other anti-apartheid activists both inside and outside the country, the repeal of discriminatory laws began in 1990. Since 1994, all ethnic and linguistic groups have held political representation in the country's liberal democracy, which comprises a parliamentary republic and nine provinces. South Africa is referred to as the "rainbow nation" to describe the country's multicultural diversity in the wake of apartheid; the World Bank classifies South Africa as an upper-middle-income economy, a newly industrialised country.
Its economy is the second-largest in Africa, the 34th-largest in the world. In terms of purchasing power parity, South Africa has the seventh-highest per capita income in Africa; however and inequality remain widespread, with about a quarter of the population unemployed and living on less than US$1.25 a day. South Africa has been identified as a middle power in international affairs, maintains significant regional influence; the name "South Africa" is derived from the country's geographic location at the southern tip of Africa. Upon formation, the country was named the Union of South Africa in English, reflecting its origin from the unification of four separate British colonies. Since 1961, the long form name in English has been the "Republic of South Africa". In Dutch, the country was named Republiek van Zuid-Afrika, replaced in 1983 by the Afrikaans Republiek van Suid-Afrika. Since 1994, the Republic has had an official name in each of its 11 official languages. Mzansi, derived from the Xhosa noun umzantsi meaning "south", is a colloquial name for South Africa, while some Pan-Africanist political parties prefer the term "Azania".
South Africa contains human-fossil sites in the world. Archaeologists have recovered extensive fossil remains from a series of caves in Gauteng Province; the area, a UNESCO World Heritage site, has been branded "the Cradle of Humankind". The sites include one of the richest sites for hominin fossils in the world. Other sites include Gondolin Cave Kromdraai, Coopers Cave and Malapa. Raymond Dart identified the first hominin fossil discovered in Africa, the Taung Child in 1924. Further hominin remains have come from the sites of Makapansgat in Limpopo Province and Florisbad in the Free State Province, Border Cave in KwaZulu-Natal Province, Klasies River Mouth in Eastern Cape Province and Pinnacle Point and Die Kelders Cave in Western Cape Province; these finds suggest that various hominid species existed in South Africa from about three million years ago, starting with Australopithecus africanus. There followed species including Australopithecus sediba, Homo ergaster, Homo erectus, Homo rhodesiensis, Homo helmei, Homo naledi and modern humans.
Modern humans have inhabited Southern Africa for at least 170,000 years. Various researchers have located pebble tools within the Vaal River valley. Settlements of Bantu-speaking peoples, who were iron-using agriculturists and herdsmen, were present south of the Limpopo River by the 4th or 5th century CE, they displaced and absorbed the original Khoisan speakers, the Khoikhoi and San peoples. The Bantu moved south; the earliest ironworks in modern-day KwaZulu-Natal Province are believed to date from around 1050. The southernmost group was the Xhosa people, whose language incorporates certain linguistic traits from the earlier Khoisan people; the Xhosa reached the Great Fish River, in today's Eastern Cape Province. As they migrated, these larger Iron Age populations
Alfa Romeo 105/115 Series Coupés
The Alfa Romeo 105 and 115 series coupés were a range of cars made by the Italian manufacturer Alfa Romeo from 1963 until 1977, based on a shortened floorpan from the Giulia saloon. They were the successors to the Giulietta Sprint coupé; the basic body shape shared by all models was designed by Giorgetto Giugiaro for Bertone. It was one of his first major projects for Bertone, borrowed from his earlier design for the Alfa Romeo 2000 Sprint/2600 Sprint; the balance of glass and metal, the influence of the shape of the front and rear glass on the shape of the cabin, the flat grille with incorporated headlamps were groundbreaking styling features for the era. A limited production convertible was a modification from the standard car by Touring of Milan, offered as a catalogue model by Alfa Romeo called the Giulia Sprint GTC. A small number of the GT Junior Zagato were built with a different, aerodynamic two-seater coupé body designed by Ercole Spada for Zagato of Milan; these too were offered by Alfa Romeo as catalogue models, as the GT 1300 Junior Zagato and GT 1600 Junior Zagato.
All models feature the four cylinder, all-light-alloy Alfa Romeo Twin Cam engine in various cubic capacities from 1290 cc to 1962 cc, all with two valves per cylinder. All versions of this engine fitted to the 105 series coupés featured twin carburettors, except for US market 1750 GTV and 2000 GTV cars which were fitted with mechanical port fuel injection by SPICA. Competition models featured cylinder heads with twin spark plugs. Common to all models was a 5-speed manual transmission and solid disc brakes on all four wheels, although in South Africa at the Brits plant a few Auto 2000 GTV were made for the local market; these featured the 3 speed ZF auto box. The rear suspension uses a solid axle with coil springs. Air conditioning and a limited slip rear differential were optional on the models. A limited slip differential was standard on the GTV 2000 for North America 1972-1974. Factory air conditioning was available on the 1973-1974 only in the USA; the 105 series coupés featured the GT model description, common to all models in one form or another.
The various models in this range can be considered in two broad categories. On one hand were Gran Turismo Veloces; these were meant to be the most sporting cars in the Alfa Romeo range and sold well to enthusiastic motorists around the world. The first model available was the Giulia Sprint GT which evolved into the Giulia Sprint GT Veloce, the 1750 GTV and the 2000 GTV, with engines increasing in cubic capacity from 1570 cc through 1779 cc to 1962 cc. A limited production convertible, the Giulia Sprint GTC, was based on the Giulia Sprint GT, modified by Touring of Milan, it was only made over two years from 1964 to 1966. On the other hand, was the GT Junior range, which featured engines with smaller cubic capacities. GT Juniors sold in great numbers to people who wanted a sporting, stylish car that handled well, but either did not require the maximum in engine power, or could not afford the taxation on larger engine capacities in some markets - most notably, Alfa Romeo's home Italian market. Junior models began with the first GT 1300 Junior in 1966.
The GT 1300 Junior continued until 1976 with the 1290 cc engine and various modifications incorporating features from the evolution of the GT's and GTV's. From 1972 a GT 1600 Junior model was available, with the 1570 cc engine; the 1300 Junior and 1600 Junior became available with a different, aerodynamic two-seater coupé body designed by Ercole Spada for Zagato of Milan. These models were GT 1600 Junior Zagato. Both categories were used to derive GTA models, which were intended for competition homologation in their respective engine size classes; the GTA's featured extensive modifications for racing, so they were priced much higher than the standard models and sold in much smaller numbers. All GTA's made were used in competition, where they had a long and successful history in various classes and category; these models included the Giulia Sprint GTA, GTA 1300 Junior, GTAm. Although not thought of as a 105 Series coupé variant, the Alfa Romeo Montreal used a strengthened and modified 105 series floorpan and suspension.
Tipo: 105.02, 105.04. Engine: 00502; the Alfa Romeo Giulia Sprint GT was the first Giulia sport model introduced, was manufactured from 1963 to 1965. It was revealed at a press event held at the newly opened Arese plant on 9 September 1963, displayed the same month at the Frankfurt Motor Show. In its original form the Bertone body is known as scalino or "step front", because of the leading edge of the engine compartment lid which sat 1/4 an inch above the nose of the car; the Giulia Sprint GT can be distinguished from the models by the following features: Exterior badging: Alfa Romeo logo on the front grille, a chrome script reading "Giulia Sprint GT" on the boot lid, rectangular "Disegno di Bertone" badges aft of the front wheel arches. Flat, chrome grille in plain, wide rectangular mesh without additional chrome bars. Single-piece chrome bumpers. Inside the cabin the padded vinyl dashboard was characterised by a concave horizontal fascia, finished in grey anti-glare crackle-effect paint. Four round instruments were inset in the fascia in front of the driver.
The larger diameter inner pair were speedometer.
A sedan — saloon — is a passenger car in a three-box configuration with separate compartments for engine and cargo. Sedan's first recorded use as a name for a car body was in 1912; the name comes from a 17th century development of a litter, the sedan chair, a one-person enclosed box with windows and carried by porters. Variations of the sedan style of body include: close-coupled sedan, club sedan, convertible sedan, fastback sedan, hardtop sedan, notchback sedan and sedanet/sedanette; the current definition of a sedan is a car with a closed body with the engine and cargo in separate compartments. This broad definition does not differentiate sedans from various other car body styles, but in practice the typical characteristics of sedans are: a B-pillar that supports the roof two rows of seats a three-box design with the engine at the front and the cargo area at the rear a less steeply sloping roofline than a coupé, which results in increased headroom for rear passenger and a less sporting appearance.
A rear interior volume of at least 33 cu ft It is sometimes suggested that sedans must have four doors. However, several sources state that a sedan can have four doors. In addition, terms such as sedan and coupé have been more loosely interpreted by car manufacturers since 2010; when a manufacturer produces two-door sedan and four-door sedan versions of the same model, the shape and position of the greenhouse on both versions may be identical, with only the B-pillar positioned further back to accommodate the longer doors on the two-door versions. A sedan chair, a sophisticated litter, was an enclosed box with windows used to transport one seated person. Porters at the front and rear carried the chair with horizontal poles. Litters date back to long before ancient Egypt and China. Sedan chairs were developed in the 1630s. Reputable etymologists suggest the name of the chair probably came through Italian dialects from the Latin sedere meaning to sit; the same experts report that the first recorded use of sedan for an automobile body occurred in 1912 when a new Studebaker model was described by its manufacturers as a sedan.
The same American dictionary provides this description: "Sedan an enclosed automobile for four or more people, having two or four doors". There were enclosed automobile bodies before 1912. Long before that time the same enclosed but horse-drawn carriages were known as broughams in the United Kingdom, they were berlinas in France and Italy. Both names are still used there for sedans. There is an unsubstantiated claim that the body of a particular 1899 Renault Voiturette Type B was the first motor vehicle, a sedan, it was a two-door two-seater vehicle with an extra external seat for a footman/mechanic. Georgano claims the earliest usage matching a modern definition of a sedan was a 1911 Speedwell sedan manufactured in the United States. In American English and Latin American Spanish, the term sedan is used. In British English, a car of this configuration is called a saloon. Hatchback sedans are known as hatchbacks. Super saloon is used to describe a high performance saloon car where sports saloon would have been used in the past.
Saloon has been used by British car manufacturers in the United States, for example, the Rolls-Royce Park Ward. In Australia and New Zealand sedan is now predominantly used, they were simply cars. In the 21st century saloon is still found in the long-established names of particular motor races. In other languages, sedans are known as berlina though they may include hatchbacks; these names, like sedan, all come from forms of passenger transport used before the advent of automobiles. In German sedans are berlines or limousines and limousines are stretch-limousines. In the United States notchback sedan distinguishes models with a horizontal trunklid; the term is only referred to in the marketing when it is necessary to distinguish between two sedan body styles of the same model range. Several sedans have a fastback profile, but instead of a trunk lid, the entire back of the vehicle lifts up. Examples include the Chevrolet Malibu Maxx, Audi A5 Sportback and Tesla Model S; the names "hatchback" and "sedan" are used to differentiate between body styles of the same model.
Therefore the term "hatchback sedan" is not used, to avoid confusion. There have been many sedans with a fastback style. Hardtop sedans were a popular body style in the United States from the 1950s to the 1970s. Hardtops are manufactured without a B-pillar leaving uninterrupted open space or, when closed, glass along the side of the car; the top was intended to look like a convertible's top but it was fixed and made of hard material that did not fold. All manufacturers in the United States from the early 1950s into the 1970s provided at least a 2-door hardtop model in their range and, if their engineers could manage it, a 4-door hardtop as well; the lack of side-bracing demanded a strong and heavy chassis frame to combat unavoidable flexing. The fashion may have delayed the introduction of unibody construction. In 1973 the US government passed Federal Motor Vehicle Safety Standard 216 creating a standard roof strength test to measure the integrity of roof structure in motor vehicles to come into effect some years later.
The layout of a car is defined by the location of the engine and drive wheels. Layouts can be divided into three categories: front-wheel drive, rear-wheel drive and four-wheel drive. Many different combinations of engine location and driven wheels are found in practice, the location of each is dependent on the application for which the car will be used; the front-engine, front-wheel-drive layout places both the internal combustion engine and driven wheels at the front of the vehicle. This is the most common layout for cars since the late 20th century; some early front-wheel drive cars from the 1930s had the engine located in the middle of the car. A rear-engine, front-wheel-drive layout is one in which the engine is between or behind the rear wheels, drives the front wheels via a driveshaft, the complete reverse of a conventional front-engine, rear-wheel-drive vehicle layout; this layout has only been used on concept cars. The front-engine, rear-wheel drive layout is one where the engine is located at the front of the vehicle and driven wheels are located at the rear.
This was the traditional automobile layout for most of the 20th century, remains the most common layout for rear-wheel drive cars. The mid-engine, rear-wheel drive layout is one where the rear wheels are driven by an engine placed just in front of them, behind the passenger compartment. In contrast to the rear-engined RR layout, the center of mass of the engine is in front of the rear axle; this layout is chosen for its low moment of inertia and favorable weight distribution. The rear-engine, rear-wheel drive layout places both the engine and drive wheels at the rear of the vehicle. In contrast to the MR layout, the center of mass of the engine is between the rear axle and the rear bumper. Although common in transit buses and coaches due to the elimination of the drive shaft with low-floor bus, this layout has become rare in passenger cars; the Porsche 911 is notable for its continuous use of the RR layout since 1963. Car drivetrains where power can be sent to all four wheels are referred to as either four-wheel drive or all-wheel drive.
The front-engine, four-wheel drive layout places the engine at the front of the vehicle and drives all four roadwheels. This layout is chosen for better control on many surfaces, is an important part of rally racing as well as off-road driving. Most four-wheel-drive layouts are front-engined and are derivatives of earlier front-engine, rear-wheel-drive designs; the mid-engine, four-wheel drive layout places the engine in the middle of the vehicle, between both axles and drives all four road wheels. Although the term "mid-engine" can mean the engine is placed anywhere in the car such that the centre of gravity of the engine lies between the front and rear axles, it is used for sports cars and racing cars where the engine is behind the passenger compartment; the motive output is sent down a shaft to a differential in the centre of the car, which in the case of an M4 layout, distributes power to both front and rear axles. The rear-engine, four-wheel drive layout places the engine at the rear of the vehicle, drives all four wheels.
This layout is chosen to improve the traction or the handling of existing vehicle designs using the rear-engine, rear-wheel-drive layout. For example, the Porsche 911 added all-wheel drive to the existing line-up of rear-wheel drive models in 1989. Automobile handling Car classification Drivetrain layout
Salerno is an ancient city and comune in Campania and is the capital of the province of the same name. It is located on the Gulf of Salerno on the Tyrrhenian Sea; the city is divided into three distinct zones: the medieval sector, the 19th century sector and the more densely populated post-war area, with its several apartment blocks. Human settlement at Salerno has a vibrant past, dating back to pre-historic times; the site has been one of the most important and strategic ports on the Mediterranean sea, yielding a rich Greco-Roman heritage. It was Principality of Salerno, in the early Middle Ages. During this time, the Schola Medica Salernitana, the first medical school in the world, was founded. In the 16th century, under the Sanseverino family, among the most powerful feudal lords in southern Italy, the city became a great centre of learning and the arts, the family hired several of the greatest intellectuals of the time. In 1694, the city was struck by several catastrophic earthquakes and plagues.
After a period of Spanish rule which would last until the 18th century, Salerno became part of the Parthenopean Republic. In recent history the city hosted Victor Emmanuel III, the King of Italy, who moved from Rome in 1943 after Italy negotiated a peace with the Allies in World War II, making Salerno the home of the "government of the South" and therefore provisional government seat for six months; some of the Allied landings during Operation Avalanche occurred near Salerno. Today Salerno is an important cultural centre in Italy. A patron saint of Salerno is Saint Matthew, the Apostle, whose relics are kept here at the crypt of Salerno Cathedral; the area of what is now Salerno has been continuously settled since pre-historical times, as the discoveries of Neolithic mummy remains documents.. The Oscan-Etruscan city of Irna, is situated across the Irno river, in what is today the quarter of Fratte; this settlement represented an important base for Etruscan trade with the nearby Greek colonies of Posidonia and Elea.
It was occupied by the Samnites around the 5th century BC as consequence of the Battle of Cumae as part of the Syracusan sphere of influence. With the Roman advance in Campania, Irna began to lose its importance, being supplanted by the new Roman colony of Salernum, developing around an initial castrum; the new city, which lost its military function in favour of its role as a trade center, was connected to Rome by the Via Popilia, which ran towards Lucania and Reggio Calabria. Archaeological remains, although fragmentary, suggest the idea of a lively city. Under the Emperor Diocletian, in the late 3rd century AD, Salernum became the administrative centre of the "Lucania and Bruttii" province. In the following century, during the Gothic Wars, the Goths were defeated by the Byzantines, the Salerno returned to the control of Constantinople, before the Lombards invaded the whole peninsula. Like many coastal cities of southern Italy, Salerno remained untouched by the newcomers, falling only in 646.
It subsequently became part of the Duchy of Benevento. Under the Lombard dukes Salerno enjoyed the most splendid period of its history. In 774 Arechis II of Benevento transferred the seat of the Duchy of Benevento to Salerno, in order to elude Charlemagne's offensive and to secure for himself the control of a strategic area, the centre of coastal and internal communications in Campania. With Arechis II, Salerno became a centre of studies with its famous Medical School; the Lombard prince ordered the city to be fortified. In 839 Salerno declared independence from Benevento, becoming the capital of a flourishing principality stretching out to Capua, northern Calabria and Apulia up to Taranto. Around the year 1000 prince Guaimar IV annexed Amalfi, Sorrento and the whole duchy of Apulia and Calabria, starting to conceive a future unification of the whole southern Italy under Salerno's arms; the coins minted in the city circulated in all the Mediterranean, with the Opulenta Salernum wording to certify its richness.
However, the stability of the Principate was continually shaken by the Saracen attacks and, most of all, by internal struggles. In 1056, one of the numerous plots led to the fall of Guaimar, his weaker son Gisulf II succeeded him. In 1077 Salerno soon lost all its territory to the Normans. On 13 December 1076, the Norman conqueror Robert Guiscard, who had married Guaimar IV's daughter Sikelgaita, besieged Salerno and defeated his brother-in-law Gisulf. In this period the royal palace of Castel Terracena and the cathedral were built, science was boosted as the Schola Medica Salernitana, considered the most ancient medical institution of European West, reached its maximum splendour. At this time in the late 11th century, the city was home to 50,000 people. Salerno played a conspicuous part in the fall of the Norman Kingdom. After the Emperor Henry VI's invasion on behalf of his wife, the heiress to the kingdom, in 1191, Salerno surrendered and promised loyalty on the mere news of an incoming army.
This so disgusted the archbishop, Nicolò d'Aiello, that he abandoned the city and fled to Naples, which held out in a siege. In 1194, the situation reversed itself: Naples capitulated, along with most other cities of the Mezzogiorno, only Salerno resisted, it was pillaged, much reducing its importance and prosperity. Henry had his reasons, though, he had e
An engine or motor is a machine designed to convert one form of energy into mechanical energy. Heat engines, like the internal combustion engine, burn a fuel to create heat, used to do work. Electric motors convert electrical energy into mechanical motion, pneumatic motors use compressed air, clockwork motors in wind-up toys use elastic energy. In biological systems, molecular motors, like myosins in muscles, use chemical energy to create forces and motion; the word engine derives from Old French engin, from the Latin ingenium–the root of the word ingenious. Pre-industrial weapons of war, such as catapults and battering rams, were called siege engines, knowledge of how to construct them was treated as a military secret; the word gin, as in cotton gin, is short for engine. Most mechanical devices invented during the industrial revolution were described as engines—the steam engine being a notable example. However, the original steam engines, such as those by Thomas Savery, were not mechanical engines but pumps.
In this manner, a fire engine in its original form was a water pump, with the engine being transported to the fire by horses. In modern usage, the term engine describes devices, like steam engines and internal combustion engines, that burn or otherwise consume fuel to perform mechanical work by exerting a torque or linear force. Devices converting heat energy into motion are referred to as engines. Examples of engines which exert a torque include the familiar automobile gasoline and diesel engines, as well as turboshafts. Examples of engines which produce thrust include rockets; when the internal combustion engine was invented, the term motor was used to distinguish it from the steam engine—which was in wide use at the time, powering locomotives and other vehicles such as steam rollers. The term motor derives from the Latin verb moto which means to maintain motion, thus a motor is a device. Motor and engine are interchangeable in standard English. In some engineering jargons, the two words have different meanings, in which engine is a device that burns or otherwise consumes fuel, changing its chemical composition, a motor is a device driven by electricity, air, or hydraulic pressure, which does not change the chemical composition of its energy source.
However, rocketry uses the term rocket motor though they consume fuel. A heat engine may serve as a prime mover—a component that transforms the flow or changes in pressure of a fluid into mechanical energy. An automobile powered by an internal combustion engine may make use of various motors and pumps, but all such devices derive their power from the engine. Another way of looking at it is that a motor receives power from an external source, converts it into mechanical energy, while an engine creates power from pressure. Simple machines, such as the club and oar, are prehistoric. More complex engines using human power, animal power, water power, wind power and steam power date back to antiquity. Human power was focused by the use of simple engines, such as the capstan, windlass or treadmill, with ropes and block and tackle arrangements; these were used in cranes and aboard ships in Ancient Greece, as well as in mines, water pumps and siege engines in Ancient Rome. The writers of those times, including Vitruvius and Pliny the Elder, treat these engines as commonplace, so their invention may be more ancient.
By the 1st century AD, cattle and horses were used in mills, driving machines similar to those powered by humans in earlier times. According to Strabo, a water powered mill was built in Kaberia of the kingdom of Mithridates during the 1st century BC. Use of water wheels in mills spread throughout the Roman Empire over the next few centuries; some were quite complex, with aqueducts and sluices to maintain and channel the water, along with systems of gears, or toothed-wheels made of wood and metal to regulate the speed of rotation. More sophisticated small devices, such as the Antikythera Mechanism used complex trains of gears and dials to act as calendars or predict astronomical events. In a poem by Ausonius in the 4th century AD, he mentions a stone-cutting saw powered by water. Hero of Alexandria is credited with many such wind and steam powered machines in the 1st century AD, including the Aeolipile and the vending machine these machines were associated with worship, such as animated altars and automated temple doors.
Medieval Muslim engineers employed gears in mills and water-raising machines, used dams as a source of water power to provide additional power to watermills and water-raising machines. In the medieval Islamic world, such advances made it possible to mechanize many industrial tasks carried out by manual labour. In 1206, al-Jazari employed a crank-conrod system for two of his water-raising machines. A rudimentary steam turbine device was described by Taqi al-Din in 1551 and by Giovanni Branca in 1629. In the 13th century, the solid rocket motor was invented in China. Driven by gunpowder, this simplest form of internal combustion engine was unable to deliver sustained power, but was useful for propelling weaponry at high speeds towards enemies in battle and for fireworks. After invention, this innovation spread throughout Europe; the Watt steam engine was the first type of steam engine to make use of steam at a pressure just above atmospheric to drive the piston he
Milan is a city in northern Italy, capital of Lombardy, the second-most populous city in Italy after Rome, with the city proper having a population of 1,372,810 while its metropolitan city has a population of 3,245,308. Its continuously built-up urban area has a population estimated to be about 5,270,000 over 1,891 square kilometres; the wider Milan metropolitan area, known as Greater Milan, is a polycentric metropolitan region that extends over central Lombardy and eastern Piedmont and which counts an estimated total population of 7.5 million, making it by far the largest metropolitan area in Italy and the 54th largest in the world. Milan served as capital of the Western Roman Empire from 286 to 402 and the Duchy of Milan during the medieval period and early modern age. Milan is considered a leading alpha global city, with strengths in the field of the art, design, entertainment, finance, media, services and tourism, its business district hosts Italy's stock exchange and the headquarters of national and international banks and companies.
In terms of GDP, it has the third-largest economy among European cities after Paris and London, but the fastest in growth among the three, is the wealthiest among European non-capital cities. Milan is considered part of the Blue Banana and one of the "Four Motors for Europe"; the city has been recognized as one of the world's four fashion capitals thanks to several international events and fairs, including Milan Fashion Week and the Milan Furniture Fair, which are among the world's biggest in terms of revenue and growth. It hosted the Universal Exposition in 1906 and 2015; the city hosts numerous cultural institutions and universities, with 11% of the national total enrolled students. Milan is the destination of 8 million overseas visitors every year, attracted by its museums and art galleries that boast some of the most important collections in the world, including major works by Leonardo da Vinci; the city is served by a large number of luxury hotels and is the fifth-most starred in the world by Michelin Guide.
The city is home to two of Europe's most successful football teams, A. C. Milan and F. C. Internazionale, one of Italy's main basketball teams, Olimpia Milano; the etymology of the name Milan remains uncertain. One theory holds that the Latin name Mediolanum planus. However, some scholars believe that lanum comes from the Celtic root lan, meaning an enclosure or demarcated territory in which Celtic communities used to build shrines. Hence Mediolanum could signify the central sanctuary of a Celtic tribe. Indeed, about sixty Gallo-Roman sites in France bore the name "Mediolanum", for example: Saintes and Évreux. In addition, another theory links the name to the boar sow an ancient emblem of the city, fancifully accounted for in Andrea Alciato's Emblemata, beneath a woodcut of the first raising of the city walls, where a boar is seen lifted from the excavation, the etymology of Mediolanum given as "half-wool", explained in Latin and in French; the foundation of Milan is credited to two Celtic peoples, the Bituriges and the Aedui, having as their emblems a ram and a boar.
Alciato credits Ambrose for his account. The Celtic Insubres, the inhabitants of the region of northern Italy called Insubria, appear to have founded Milan around 600 BC. According to the legend reported by Livy, the Gaulish king Ambicatus sent his nephew Bellovesus into northern Italy at the head of a party drawn from various Gaulish tribes; the Romans, led by consul Gnaeus Cornelius Scipio Calvus, fought the Insubres and captured the city in 222 BC. They conquered the entirety of the region, calling the new province "Cisalpine Gaul" – "Gaul this side of the Alps" – and may have given the site its Latinized Celtic name of Mediolanum: in Gaulish *medio- meant "middle, center" and the name element -lanon is the Celtic equivalent of Latin -planum "plain", thus *Mediolanon meant " in the midst of the plain". In 286 the Roman Emperor Diocletian moved the capital of the Western Roman Empire from Rome to Mediolanum. Diocletian himself chose to reside at Nicomedia in the Eastern Empire, leaving his colleague Maximian at Milan.
Maximian built several gigantic monuments, the large circus, the thermae or "Baths of Hercules", a large complex of imperial palaces and other services and buildings of which fewer visible traces remain. Maximian increased the city area surrounded by a new, larger stone wall encompassing an area of 375 acres with many 24-sided towers; the monumental area had twin towers. From Mediolanum the Emperor Constantine issued the Edict of Milan in 313 AD, granting tolerance to all religions within the Empire, thus paving the way for Christianity to become the dominant religion of Roman Europe. Constantine had come to Mediolanum to celebrate the wedding of his sister