1.
United Kingdom
–
The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom or Britain, is a sovereign country in western Europe. Lying off the north-western coast of the European mainland, the United Kingdom includes the island of Great Britain, Northern Ireland is the only part of the United Kingdom that shares a land border with another sovereign state—the Republic of Ireland. The Irish Sea lies between Great Britain and Ireland, with an area of 242,500 square kilometres, the United Kingdom is the 78th-largest sovereign state in the world and the 11th-largest in Europe. It is also the 21st-most populous country, with an estimated 65.1 million inhabitants, together, this makes it the fourth-most densely populated country in the European Union. The United Kingdom is a monarchy with a parliamentary system of governance. The monarch is Queen Elizabeth II, who has reigned since 6 February 1952, other major urban areas in the United Kingdom include the regions of Birmingham, Leeds, Glasgow, Liverpool and Manchester. The United Kingdom consists of four countries—England, Scotland, Wales, the last three have devolved administrations, each with varying powers, based in their capitals, Edinburgh, Cardiff and Belfast, respectively. The relationships among the countries of the UK have changed over time, Wales was annexed by the Kingdom of England under the Laws in Wales Acts 1535 and 1542. A treaty between England and Scotland resulted in 1707 in a unified Kingdom of Great Britain, which merged in 1801 with the Kingdom of Ireland to form the United Kingdom of Great Britain and Ireland. Five-sixths of Ireland seceded from the UK in 1922, leaving the present formulation of the United Kingdom of Great Britain, there are fourteen British Overseas Territories. These are the remnants of the British Empire which, at its height in the 1920s, British influence can be observed in the language, culture and legal systems of many of its former colonies. The United Kingdom is a country and has the worlds fifth-largest economy by nominal GDP. The UK is considered to have an economy and is categorised as very high in the Human Development Index. It was the worlds first industrialised country and the worlds foremost power during the 19th, the UK remains a great power with considerable economic, cultural, military, scientific and political influence internationally. It is a nuclear weapons state and its military expenditure ranks fourth or fifth in the world. The UK has been a permanent member of the United Nations Security Council since its first session in 1946 and it has been a leading member state of the EU and its predecessor, the European Economic Community, since 1973. However, on 23 June 2016, a referendum on the UKs membership of the EU resulted in a decision to leave. The Acts of Union 1800 united the Kingdom of Great Britain, Scotland, Wales and Northern Ireland have devolved self-government
2.
Red
–
Red is the color at the longer-wavelengths end of the spectrum of visible light next to orange, at the opposite end from violet. Red color has a predominant light wavelength of roughly 620–740 nanometers, light with a longer wavelength than red but shorter than terahertz radiation and microwave is called infrared. Red is one of the secondary colors, resulting from the combination of yellow. Traditionally, it was viewed as a primary colour, along with yellow and blue, in the RYB color space and traditional color wheel formerly used by painters. Reds can vary in shade from light pink to very dark maroon or burgundy. Red is the color of cyan. In nature, the red color of blood comes from hemoglobin, the red color of the Grand Canyon and other geological features is caused by hematite or red ochre, both forms of iron oxide. It also causes the red color of the planet Mars, the color of autumn leaves is caused by pigments called anthocyanins, which are produced towards the end of summer, when the green chlorophyll is no longer produced. One to two percent of the population has red hair, the color is produced by high levels of the reddish pigment pheomelanin. Since red is the color of blood, it has historically been associated with sacrifice, danger, modern surveys in the United States and Europe show red is also the color most commonly associated with heat, activity, passion, sexuality, anger, love and joy. In China, India and many other Asian countries it is the color of symbolizing happiness, since the 19th century, red has also been associated with socialism and communism. The word red is derived from the Old English rēad, the word can be further traced to the Proto-Germanic rauthaz and the Proto-Indo European root rewdʰ-. In Sanskrit, the word means red or blood. In the Akkadian language of Ancient Mesopotamia and in the modern Inuit language of Inuit, the words for colored in Latin and Spanish both also mean red. In Portuguese the word for red is vermelho, which comes from Latin vermiculus, in the Russian language, the word for red, Кра́сный, comes from the same old Slavic root as the words for beautiful—красивый and excellent—прекрасный. Thus Red Square in Moscow, named long before the Russian Revolution, in heraldry, the word gules is used for red. Red can vary in hue from orange-red to violet-red, and for each hue there is a variety of shades and tints. Red hematite powder was found scattered around the remains at a grave site in a Zhoukoudian cave complex near Beijing
3.
White
–
White is an achromatic color, a color without hue. An incoming light to the eye that stimulates all its three types of color sensitive cone cells in nearly equal amounts results in white. White is one of the most common colors in nature, the color of sunlight, snow, milk, chalk, limestone, in many cultures white represents or signifies purity, innocence, and light, and is the symbolic opposite of black, or darkness. According to surveys in Europe and the United States, white is the color most often associated with perfection, the good, honesty, cleanliness, the beginning, the new, neutrality, and exactitude. In ancient Egypt and ancient Rome, priestesses wore white as a symbol of purity, in the Middle Ages and Renaissance a white unicorn symbolized chastity, and a white lamb sacrifice and purity, the widows of kings dressed in white rather than black as the color of mourning. It was also used in 20th century modern architecture as a symbol of modernity, simplicity. White is an important color for almost all world religions, the Pope, the head of the Roman Catholic Church, has worn white since 1566, as a symbol of purity and sacrifice. In Islam, and in the Shinto religion of Japan, it is worn by pilgrims, in Western cultures and in Japan, white is the most common color for wedding dresses, symbolizing purity and virginity. In many Asian cultures, white is also the color of mourning, the white color on television screens and computer monitors is created with the RGB color model by mixing red, green and blue light at equal intensities. The word white continues Old English hwīt, ultimately from a Common Germanic *χwītaz also reflected in OHG wîz, ON hvítr, the root is ultimately from Proto-Indo-European language *kwid-, surviving also in Sanskrit śveta to be white or bright and Slavonic světŭ light. The Icelandic word for white, hvítur, is derived from the Old Norse form of the word hvítr. Common Germanic also had the word *blankaz, borrowed into Late Latin as *blancus, the antonym of white is black. Some non-European languages have a variety of terms for white. The Inuit language has seven different words for seven different nuances of white, Japanese has six different words, depending upon brilliance or dullness, or if the color is inert or dynamic. White was one of the first colors used in art, the Lascaux Cave in France contains drawings of bulls and other animals drawn by paleolithic artists between 18,000 and 17,000 years ago. Paleolithic artists used calcite or chalk, they sometimes as a background, sometimes as a highlight, along with charcoal and red, in ancient Egypt, white was connected with the goddess Isis. The priests and priestesses of Isis dressed only in white linen, in Greece and other ancient civilizations, white was often associated with mothers milk. In Greek mythology, the chief god Zeus was nourished at the breast of the nymph Amalthea, in the Talmud, milk was one of four sacred substances, along with wine, honey, and the rose
4.
Tablet (pharmacy)
–
A tablet is a pharmaceutical dosage form. Tablets may be defined as the solid unit dosage form of medicament or medicaments with or without suitable excipients and it comprises a mixture of active substances and excipients, usually in powder form, pressed or compacted from a powder into a solid dose. The compressed tablet is the most popular form in use today. About two-thirds of all prescriptions are dispensed as solid dosage forms, a tablet can be formulated to deliver an accurate dosage to a specific site, it is usually taken orally, but can be administered sublingually, buccally, rectally or intravaginally. The tablet is just one of the forms that an oral drug can take such as syrups, elixirs, suspensions. Medicinal tablets were made in the shape of a disk of whatever color their components determined. Tablets are often stamped with symbols, letters, and numbers, sizes of tablets to be swallowed range from a few millimeters to about a centimeter. Pills are thought to date back to around 1500 BC, earlier medical recipes, such as those from 4000 BC, were for liquid preparations rather than solids. The first references to pills were found on papyruses in ancient Egypt, medicinal ingredients, such as plant powders or spices, were mixed in and formed by hand to make little balls, or pills. In ancient Greece, such medicines were known as katapotia, and the Roman scholar Pliny, Pills have always been difficult to swallow and efforts long have been made to make them go down easier. In medieval times, people coated pills with slippery plant substances, another approach, used as recently as the 19th century, was to gild them in gold and silver, although this often meant that they would pass through the digestive tract with no effect. In the 1800s sugar-coating and gelatin-coating was invented, as were gelatin capsules, in 1843, the British painter and inventor William Brockedon was granted a patent for a machine capable of Shaping Pills, Lozenges and Black Lead by Pressure in Dies. The device was capable of compressing powder into a tablet without use of an adhesive, today, pills include tablets, capsules, and variants thereof like caplets—essentially anything with medication that can be digested, minus the liquid forms, colloquially falls into the pill category. A caplet is a smooth, coated, oval-shaped medicinal tablet in the shape of a capsule. Many caplets have a running down the middle so they may be split in half easier. An orally disintegrating tablet or orodispersible tablet, is a dosage form available for a limited range of over-the-counter. In the tablet-pressing process, it is important that all ingredients be fairly dry, powdered or granular, somewhat uniform in particle size, content uniformity ensures that the same API dose is delivered with each tablet. Some APIs may be tableted as pure substances, but this is rarely the case, normally, a pharmacologically inactive ingredient termed a binder is added to help hold the tablet together and give it strength
5.
Electronic color code
–
The electronic color code is used to indicate the values or ratings of electronic components, usually for resistors, but also for capacitors, inductors, diodes and others. A separate code, the 25-pair color code, is used to identify wires in some telecommunications cables, in 1952, it was standardized in IEC62,1952 by the International Electrotechnical Commission and since 1963 also published as EIA RS-279. Originally only meant to be used for fixed resistors, the code was extended to also cover capacitors with IEC62,1968. The code was adopted by national standards like DIN40825, BS1852. The current international standard defining marking codes for resistors and capacitors is IEC60062,2016, colorbands were used because they were easily and cheaply printed on tiny components. However, there were drawbacks, especially for color blind people, overheating of a component or dirt accumulation, may make it impossible to distinguish brown from red or orange. Advances in printing technology have now made printed numbers practical on small components, where passive components come in surface mount packages, their values are identified with printed alphanumeric codes instead of a color code. To distinguish left from there is a gap between the C and D bands. Band A is the first significant figure of component value band B is the significant figure. Gold signifies that the tolerance is ±5%, so the resistance could lie anywhere between 4,465 and 4,935 ohms. Resistors manufactured for use may also include a fifth band which indicates component failure rate. Tight tolerance resistors may have three bands for significant figures rather than two, or an additional band indicating temperature coefficient, in units of ppm/K, all coded components have at least two value bands and a multiplier, other bands are optional. The standard color code per IEC60062,2016 is as follows, Resistors use preferred numbers for their specific values and these values repeat for every decade of magnitude,6.8,68,680, and so forth. In the E24 series the values are related by the 24th root of 10, while E12 series are related by the 12th root of 10, the tolerance of device values is arranged so that every value corresponds to a preferred number, within the required tolerance. Zero ohm resistors are made as lengths of wire wrapped in a body which can be substituted for another resistor value in automatic insertion equipment. They are marked with a black band. The other end of the resistor was colored gold or silver to give the tolerance, capacitors may be marked with 4 or more colored bands or dots. The colors encode the first and second most significant digits of the value, additional bands have meanings which may vary from one type to another
6.
Jump start (vehicle)
–
A jump start, also called a boost, is a method of starting a vehicle with a discharged starting battery. A temporary connection is made to the battery of another vehicle, the external supply of electricity recharges the disabled vehicles battery and provides some of the power needed to crank the engine. Once the vehicle has been started, its normal charging system will recharge, if the vehicle charging system is functional, normal operation of the vehicle will restore the charge of the battery. Motorists may carry jumper cables in case of accidental discharge of the vehicle battery, safe procedures for connecting and disconnecting cables are given in the vehicle manual. The alligator clips may be covered in insulation to prevent inadvertent shorting, clips may be made of copper or steel. Alligator clips are marked by black and red to indicate the polarity. Operation of a battery may, in case of overcharge. Jump start procedures are found in the vehicle owners manual. The recommended sequence of connections is intended to reduce the chance of accidentally shorting the good battery or igniting hydrogen gas, jumper cables should not be used to interconnect between different voltage systems. Connecting 6 V and 12 V systems together may cause damage, if the dead battery is physically damaged, has a low electrolyte level, is decayed or frozen, a jump start will not repair the battery. A vehicle with a battery should not be jump started. A hand-portable battery, equipped with attached cables and charger, can be used similarly to another vehicles battery, a self-contained jump box contains a battery and connects directly to the battery of the engine that needs a boost. Portable boosters may automatically sense the batterys polarity prior to sending power to the vehicle, there are various portable jump starters that are multi-functional and can be used to charge other electronic devices as well. An alternative to jumper cables is a used to interconnect the 12 volt power outlets of two vehicles. While this eliminates concerns with incorrect connections and generation of arcs near battery terminals and this method works by slowly recharging the battery, not by providing the current needed for cranking. The engine cranking motor current draw will exceed the rating in a cigarette lighter outlet. Motorists and service garages often have portable battery operated from AC power. Very small trickle chargers are intended only to maintain a charge on a parked or stored vehicle, battery chargers may be strictly manual, or may include controls for time and charging voltage
7.
Optical fiber cable
–
An optical fiber cable, also known as fiber optic cable, is a cable containing one or more optical fibers that are used to carry light. The optical fiber elements are typically coated with plastic layers. Different types of cable are used for different applications, for long distance telecommunication. Optical fiber consists of a core and a layer, selected for total internal reflection due to the difference in the refractive index between the two. In practical fibers, the cladding is coated with a layer of acrylate polymer or polyimide. This coating protects the fiber from damage but does not contribute to its optical waveguide properties, individual coated fibers then have a tough resin buffer layer and/or core tube extruded around them to form the cable core. Several layers of protective sheathing, depending on the application, are added to form the cable, rigid fiber assemblies sometimes put light-absorbing glass between the fibers, to prevent light that leaks out of one fiber from entering another. This reduces cross-talk between the fibers, or reduces flare in fiber bundle imaging applications, for indoor applications, the jacketed fiber is generally enclosed, with a bundle of flexible fibrous polymer strength members like aramid, in a lightweight plastic cover to form a simple cable. Each end of the cable may be terminated with an optical fiber connector to allow it to be easily connected and disconnected from transmitting and receiving equipment. For use in more environments, a much more robust cable construction is required. In loose-tube construction the fiber is laid helically into semi-rigid tubes and this protects the fiber from tension during laying and due to temperature changes. Loose-tube fiber may be dry block or gel-filled, dry block offers less protection to the fibers than gel-filled, but costs considerably less. Instead of a tube, the fiber may be embedded in a heavy polymer jacket. Tight buffer cables are offered for a variety of applications, Breakout cables normally contain a ripcord, two non-conductive dielectric strengthening members, an aramid yarn, and 3 mm buffer tubing with an additional layer of Kevlar surrounding each fiber. The ripcord is a cord of strong yarn that is situated under the jacket of the cable for jacket removal. Distribution cables have an overall Kevlar wrapping, a ripcord, and these fiber units are commonly bundled with additional steel strength members, again with a helical twist to allow for stretching. A critical concern in outdoor cabling is to protect the fiber from contamination by water and this is accomplished by use of solid barriers such as copper tubes, and water-repellent jelly or water-absorbing powder surrounding the fiber. Finally, the cable may be armored to protect it from environmental hazards, in September 2012, NTT Japan demonstrated a single fiber cable that was able to transfer 1 petabit per second over a distance of 50 kilometers
8.
Three-phase electric power
–
Three-phase electric power is a common method of alternating-current electric power generation, transmission, and distribution. It is a type of system and is the most common method used by electrical grids worldwide to transfer power. It is also used to large motors and other heavy loads. The three-phase system was invented by Galileo Ferraris, Mikhail Dolivo-Dobrovolsky, Jonas Wenström. The common reference is usually connected to ground and often to a current-carrying conductor called the neutral. Due to the difference, the voltage on any conductor reaches its peak at one third of a cycle after one of the other conductors. This phase delay gives constant power transfer to a linear load. It also makes it possible to produce a magnetic field in an electric motor. In a three-phase system feeding a balanced and linear load, the sum of the currents of the three conductors is zero. In other words, the current in each conductor is equal in magnitude to the sum of the currents in the two, but with the opposite sign. The return path for the current in any phase conductor is the two phase conductors.5 times as many wires. Thus, the ratio of capacity to conductor material is doubled, the same ratio of capacity to conductor material can also be attained with a center-grounded single-phase system. However, two-phase power results in a smooth torque in a generator or motor. Three-phase systems may also have a wire, particularly in low-voltage distribution. The neutral allows three separate single-phase supplies to be provided at a constant voltage and is used for supplying groups of domestic properties which are each single-phase loads. The connections are arranged so that, as far as possible in each group, further up the distribution system, the currents are usually well balanced. Transformers may be wired in a way that they have a secondary but a three-wire primary while allowing unbalanced loads. This makes it possible to reduce the size of the neutral conductor because it carries little or no current, with a balanced load, all the phase conductors carry the same current and so can be the same size
9.
Sea mark
–
Marks are shown on nautical charts, using symbols that indicate their colour, shape and light characteristic, and are usually identified by name or number. For historical reasons, there are two regions of lateral marks in use, IALA Region B in the Americas, the Philippines, South Korea, the two regions differ principally in the colours used to denote the two sides of a channel. When approaching a harbour from seaward, Region A places conical green marks to starboard, in Region B these are replaced with conical red marks to starboard and cylindrical green ones to port. This can be remembered with the mnemonic Red, right, return, another Region B mnemonic, which also helps with buoy numbering is Even Red Left Port - Even Numbered buoys are red, on your left side leaving port. In any case, since in many harbours it is not always apparent which direction is seaward, additionally, since marks may be off station due to collision with ships, storms or other factors, they should be used with caution and not relied on solely for navigation. The two regions are referred to as two systems, which was the original intent. In 1980 it was decided however to combine these systems and distinguish between regions, in a wider sense the phrase sea mark is often understood to include all kinds of landmarks, structures and devices that can be used to provide warning and guiding signs to mariners. Thus a sea mark can be and often is located on dry land, examples of land-based sea marks are various signal lights and leading marks. The latter are used to indicate the centerline of a fairway in narrow passages. Sea marks may also on occasion be used to mark the boundaries of defensive sea minefields, or the safe lanes through same. Lateral mark Cardinal mark Special mark Safe water mark Isolated danger mark Leading lights Buoy Lightvessel Lighthouse Landmark Racon ATON
10.
Traffic light
–
The worlds first, manually operated gas-lit traffic signal was short lived. Installed in London in December 1868, it exploded less than a month later, Traffic control started to seem necessary in the late 1890s and Earnest Sirrine from Chicago patented the first automated traffic control system in 1910. It used the words STOP and PROCEED, although neither word lit up, Traffic lights alternate the right of way accorded to users by displaying lights of a standard colour following a universal colour code. In the typical sequence of phases, The green light allows traffic to proceed in the direction denoted, if it is safe to do so. The amber light warns that the signal is about to change to red, in a number of countries – among them the United Kingdom – a phase during which red and yellow are displayed together indicates that the signal is about to change to green. A flashing amber indication is a warning signal, in the United Kingdom, a flashing amber light is used only at pelican crossings, in place of the combined red–amber signal, and indicates that drivers may pass if no pedestrians are on the crossing. The red signal prohibits any traffic from proceeding, a flashing red indication is treated as a stop sign. In some countries traffic signals will go into a flashing mode if the Conflict Monitor detects a problem, the signal may display flashing yellow to the main road and flashing red to the side road, or flashing red in all directions. Flashing operation can also be used during times of day when traffic is light, before traffic lights traffic police controlled the flow of traffic, a well-documented example being that on London Bridge in 1722. Three men were given the task of directing traffic coming in, each officer would help direct traffic coming out of Southwark into London and he made sure all traffic stayed on the west end of the bridge. A second officer would direct traffic on the east end of the bridge to control the flow of people leaving London and going into Southwark. The main reason for the light was that there was an overflow of horse-drawn traffic over Westminster Bridge which forced thousands of pedestrians to walk next to the Houses of Parliament. The design combined three semaphore arms with red and green gas lamps for use, on a pillar. The gas lantern was manually turned by a police officer. The signal was 22 feet high, at night a red light would command Stop and a green light would mean use Caution. Although it was said to be successful at controlling traffic, its life was brief. It exploded on 2 January 1869, as a result of a leak in one of the gas lines underneath the pavement, injuring or killing the policeman who was operating it. In the first two decades of the 20th century semaphore traffic signals, like the one in London, were in use all over the United States with each state having its own design of the device, One good example was from Toledo, Ohio in 1908
11.
Fire extinguisher
–
A fire extinguisher is an active fire protection device used to extinguish or control small fires, often in emergency situations. It is not intended for use on a fire, such as one which has reached the ceiling, endangers the user. Typically, a fire extinguisher consists of a cylindrical pressure vessel containing an agent which can be discharged to extinguish a fire. Fire extinguishers manufactured with non-cylindrical pressure vessels also exist, but are less common, in the United States, fire extinguishers in all buildings other than houses are generally required to be serviced and inspected by a fire protection service company at least annually. Some jurisdictions require more frequent service for fire extinguishers, the servicer places a tag on the extinguisher to indicate the type of service performed. There are two types of fire extinguishers, stored-pressure and cartridge-operated. In stored pressure units, the expellant is stored in the chamber as the firefighting agent itself. Depending on the agent used, different propellants are used, with dry chemical extinguishers, nitrogen is typically used, water and foam extinguishers typically use air. Stored pressure fire extinguishers are the most common type, Cartridge-operated extinguishers contain the expellant gas in a separate cartridge that is punctured prior to discharge, exposing the propellant to the extinguishing agent. This type is not as common, used primarily in areas such as industrial facilities and they have the advantage of simple and prompt recharge, allowing an operator to discharge the extinguisher, recharge it, and return to the fire in a reasonable amount of time. Unlike stored pressure types, these extinguishers use compressed carbon dioxide instead of nitrogen, although nitrogen cartridges are used on low temperature models. Cartridge operated extinguishers are available in dry chemical and dry powder types in the U. S. and in water, wetting agent, foam, dry chemical, Fire extinguishers are further divided into handheld and cart-mounted. Handheld extinguishers weigh from 0.5 to 14 kilograms, and are hence, cart-mounted units typically weigh more than 23 kilograms. These wheeled models are most commonly found at sites, airport runways, heliports, as well as docks. The first fire extinguisher of which there is any record was patented in England in 1723 by Ambrose Godfrey and it consisted of a cask of fire-extinguishing liquid containing a pewter chamber of gunpowder. This was connected with a system of fuses which were ignited, exploding the gunpowder and this device was probably used to a limited extent, as Bradleys Weekly Messenger for November 7,1729, refers to its efficiency in stopping a fire in London. The modern fire extinguisher was invented by British Captain George William Manby in 1818, the soda-acid extinguisher was first patented in 1866 by Francois Carlier of France, which mixed a solution of water and sodium bicarbonate with tartaric acid, producing the propellant CO2 gas. A soda-acid extinguisher was patented in the U. S. in 1881 by Almon M. Granger and his extinguisher used the reaction between sodium bicarbonate solution and sulfuric acid to expel pressurized water onto a fire
12.
Utility location
–
Utility location is the process of identifying and labeling public utility mains that are underground. In some locations, major oil and gas pipelines, national defense communication lines, mass transit, rail, public utility systems are often run underground, some by the very nature of their function, others for convenience or aesthetics. Before digging, local governments require that the underground systems locations be denoted and approved. Because of the different types of materials that go into manufacturing each of the different types of underground lines. For metal pipes and cables, this is often done with electromagnetic equipment consisting of a transmitter, for other types of pipe, such as plastic or concrete, other types of radiolocation or modern ground-penetrating radar must be used. Location by these means is necessary because maps often lack the pinpoint precision needed to ensure proper clearance. In older cities, it is especially a problem since maps may be very inaccurate, a few utilities are permanently marked with short posts or bollards, mainly for lines carrying petroleum products. This may be done because of venting requirements, and also serves to indicate the location of facilities that are especially hazardous if disturbed. Call before you dig, Know Whats Below, lines on the other side of the meter or service connection are considered to be part of the customers property and will typically not be located by these services. Hitting a water main may also trigger local flooding or require a boil-water advisory, the following are the partial list of countries with one-call for utility location, Australia, The national dial before you dig number is 1100. Canada, In Canada, there is no unified number for the country, however, it has the Click Before You Dig website that provides access to the hotline for each of the provinces. United States, As required by law and assigned by the US Federal Communications Commission, Utility color codes are used to identify existing underground utilities in construction areas, to protect them from damage during excavation. Colored lines, flags, or both are used to mark the location and denote the type of underground utility, a special type of spray paint, which works when the can is upside-down, is used to mark lines, often in a fluorescent color. On flags, a logo often identifies the company or municipal utility which the lines belong to, flags may also be an advertisement for a company which has installed an irrigation system for lawns or gardens. These markings are not related to utility locating, in Canada, the provinces adopt the use of APWA Uniform Color Codes. The United Kingdom uses a similar to the US one, for marking underground utilities, such as telephone, gas, water. The system is based entirely on convention without any written standard and these markings are color-coded, and are painted by contractors onto the pavement. The main colors based on the convention are used in the way as in the US, red for electricity, yellow for gas
