A color code or colour code is a system for displaying information by using different colors. The earliest examples of color codes in use are for long distance communication by use of flags, as in semaphore communication; the United Kingdom adopted a color code scheme for such communication wherein red signified danger and white signified safety, with other colors having similar assignments of meaning. As chemistry and other technologies advanced, it became expedient to use coloration as a signal for telling apart things that would otherwise be confusingly similar, such as wiring in electrical and electronic devices, pharmaceutical pills; the use of color codes has been extended to abstractions, such as the Homeland Security Advisory System color code in the United States. Hospital emergency codes incorporate colors, although they may include numbers, may not conform to a uniform standard. Color codes do present some potential problems. On forms and signage, the use of color can distract from white text.

They are difficult for color blind and blind people to interpret, for those with normal color vision, use many colors to code many variables can lead to use of confusingly similar colors. Systems incorporating color-coding include: In electronics: Electrical wiring – AC power phase and grounding wires Electronic color code – for electronic components Jumper cables used to jump-start a vehicle Surround sound ports and cables Audio connectors Video connectors Optical fibers PC connectors and ports Three-phase electric power 25-pair color code – telecommunications wiring Ethernet twisted-pair wiring – local area networks In video games Health and magic points To distinguish friend from foe, for instance in StarCraft, Halo, or League of Legends To distinguish rarity or quality of items in adventure and role-playing games In navigation: Navigation light Sea mark Characteristic light Traffic lights Other technology: Bottled gases Fire extinguishers Underground utility location Black hat hacking, white hat, grey hat kerbside collection In military use: NATO Military Symbols for Land Based Systems#Affiliation Artillery shells and other munitions, which are color-coded according to their pyrotechnic contents Rainbow Herbicides List of Rainbow Codes In social functions: Cooper's Color Code of the combat mindset ISO 22324, Guidelines for color-coded alerts in public warning Handkerchief code Ribbon colors see: Category:Ribbon symbolism Rank in Judo Blue-collar worker, white-collar worker, pink-collar worker, grey-collar, green-collar worker At point of sale Secondary notation

Mary McCaslin is an American folk singer who writes and performs contemporary folk music. She has recorded for Philo Records and traveled and performed with her ex-husband, Jim Ringer, her music ranges from ballads of the old west to her own songs of modern times. She is regarded as a pioneer of open guitar tunings, known for her distinctive vocal style, her influences can be heard in many younger folk performers. She is known for her renditions of pop standards and rock classics, such as "Ghost Riders In The Sky", "The Wayward Wind", the Beatles' "Things We Said Today", the Supremes' "My World Is Empty", her versions of the Beatles' "Blackbird" and the Who's "Pinball Wizard" are noted for her clawhammer banjo accompaniment. Her most popular folk songs are "Way Out West" and "Old Friends". McCaslin's music shows a variety of influences, including the western ballads of Marty Robbins, the guitar playing of Joan Baez and Joni Mitchell, the singing and banjo playing of Hedy West, the vocal inflections of the Beatles and the Bee Gees.

Writing of McCaslin's Way Out West LP, Robert Christgau said in Christgau's Record Guide: Rock Albums of the Seventies, "Without self-dramatization—she favors plain melodies and commonplace imagery and her singing is gamely unhistrionic—this woman explores Joni Mitchell's territory with equal intelligence, more charm, no drums."Her songs have been recorded by Tom Russell, Bill Staines, Gretchen Peters, David Bromberg, Kate Wolf, Stan Rogers and Còig. The Grand Canyon Railroad has used her song "Last Cannonball" for its promotional television ad. 1969 Barnaby 212 35002 "GOODNIGHT EVERYBODY" 1973 Philo 1011 "WAY OUT WEST" 1975 Philo 1024 "PRAIRIE IN THE SKY" 1977 Philo 1046 "OLD FRIENDS" 1978 Philo 1055 "THE BRAMBLE & THE ROSE" 1979 Mercury "SUNNY CALIFORNIA" 1981 Flying Fish 203 "A LIFE AND TIME" 1984 Philo 1075 "THE BEST OF MARY McCASLIN" 1992 Philo 1149 "THE BEST OF MARY McCASLIN: THINGS WE SAID TODAY" 1994 Philo 1160 "BROKEN PROMISES" 1999 Capitol "RAIN - The Lost Album" Bear Family BCD 16232 AH 2002 Mitchell/Collins "GIRLS FROM SANTA CRUZ" concert with Lacy J. Dalton and Ginny Mitchell 2006 Mary McCaslin "BETTER LATE THAN NEVER" marymccaslin.com

Nellie McAleney Revell was an American journalist, publicist, vaudeville performer and radio broadcaster. Nellie McAleney was born in Riverton, the daughter of Hamilton Hugh McAleney and Mary Elizabeth Evans McAleney, her father was an Irish-born Civil War veteran. At other times, she claimed her father was a press agent who worked for such politicians as Grover Cleveland. In addition, at some times, she told reporters she had been born into a circus family, although this too is difficult to verify. McAleney started working for newspapers as a teenager, she worked in Chicago, Seattle, New York, San Francisco as a young woman, building a reputation for covering nontraditional stories for women reporters at the time, such as a prize fight, the Haymarket Riot, the Iroquois Theatre fire. She traveled to Russia in 1895 to cover Czar Nicholas II's coronation, to England for Queen Victoria's funeral in 1901, the murder trial of Harry K. Thaw in New York City in 1906, she became known for insisting. Revell moved into publicity work after 1906, with jobs promoting vaudeville shows and movie theatres.

She became the press agent for such performers as Al Jolson, Lillie Langtry, Lillian Russell, Will Rogers, had her own act and performing monologues. In 1919 Revell became ill with a "spinal trouble" that kept her hospitalized in a plaster cast for several years, under the care of orthopedic surgeons Adolf Lorenz and Reginald Sayre, she worked and wrote newspaper columns from her hospital bed, including a regular column for Variety magazine, which she called "Bed-Side Chats." She embracing the label "the world's most famous invalid". Illustrators Rube Goldberg, Tad Dorgan, James Montgomery Flagg and Grace Drayton made drawings of Revell in her hospital room. Benefit performances by some of her clients and colleagues were held to help her manage expenses. Hospitalized and chronically ill women wrote letters to Revell, seeking her advice for keeping hope and a positive attitude, she wrote three books about her ordeal: Right Off the Chest, Fightin' Through, Funny Side Out. She used a wheelchair afterward, but was able to walk again by 1925, when she was planning a lecture tour.

Revell's novel Spangles, about the circus, was adapted for the screen in 1926. She contributed to screenplays for The Beach Club and The Mighty, wrote titles for several silent pictures, including The Magic Flame, The Golf Nut, Smith's Restaurant, Smith's Farm Days, she wrote advice for an instructional manual, Writing for Vaudeville, the introduction to a memoir by Sol Rothschild, It Can Be Done: A True Story. She worked in radio during the 1930s and 1940s, conducting celebrity interviews as host of a show called Neighbor Nell and Nellie Revell Presents, which ran for years on NBC radio, she retired in 1947. "They've operated on me for everything except dandruff," she joked about her ongoing health issues. Nellie McAleney was described as "a large woman and opinionated, not afraid to step face-to-face with any man." She married three times. Her first husband was a circus agent, her second husband was Joseph Revell. She married her third husband, agent Arthur J. Kellar, in 1913, she was widowed when Kellar died in 1940.

She had twin daughters. Nellie McAleney Revell died in 1958, aged 85 years, her grave in Springfield, Illinois was unmarked until 2016, when two nieces and other relatives dedicated a memorial there. Nellie McAleney Revell on IMDb