Cos

Cos, COS or CoS, may refer to:

Maths, science and technology

Cosine, a trigonometric function
COS cells, a cell line used by biologists
Carbonyl sulfide, a chemical compound
Class of service (CoS), a 3 bit field within a layer two Ethernet frame header defined by IEEE 802.1p
Class of service (COS), a configuration parameter in legacy telephone systems
Cobalt sulfide, a chemical compound
Cray Operating System, a proprietary operating system Cray supercomputers
Crypto Operating System, the development name of a Mac-compatible operating system
CatOS, an obsolete operating system for Cisco Catalyst devices
Cosmic Origins Spectrograph, an ultraviolet instrument installed on the Hubble Space Telescope
Central office switching, a system or unit that connects telephone calls

Chief of Staff, the coordinator of the supporting staff of an organization
Chief of Station, an official appointed as chief of a stationary post
Chief of Station, also known as resident spy, the chief spy operating in a foreign nation
Roman consul, the highest elected political office of the Roman Republic and the Empire

Charity Organization Society, a private charity (late 19th century to early 20th century) for information on the poor
Children's Orchestra Society, a non-profit organization in New York City for musically talented children and teens
Commandement des Opérations Spéciales, a French organization that coordinates special forces of all military branches
Community of Science, online database
Cooper Ornithological Society, an ornithological society founded in 1893 in California
Church of Satan, an organization for those who lead their life according to The Satanic Bible
Church of Scientology, an organization devoted to the practise and the promotion of the Scientology belief system
Church of Scotland, the national church of Scotland
Council of State, an advisory body of many countries
Consequence of Sound, a Chicago-based music website

CoS, Chance of Success, used in Oil and Gas exploration to give an indication of the chance of finding commercial Oil/Gas reserve

Cos lettuce, a variety of lettuce
CoyotAir (airline designator code), from Spain
Cost of sales, the direct costs attributable to the production of the goods sold by a company
Chicks on Speed, an electropop group which started in Munich
Martín Perfecto de Cos (1800–1854), 19th-century Mexican general, brother in law of Presidente & General Antonio Lopez de Santa Anna
COS (Collection of Style), a fashion line by H&M
A nickname for comedian Bill Cosby, and the title of a 1976 sketch comedy television series hosted by Cosby IMDB
An old pet form for "cousin"
Informal abbreviation for the book Harry Potter and the Chamber of Secrets