POS

POS, Pos or PoS may refer to:

Linguistics

 * Part of speech, the role that a word or phrase plays in a sentence
 * Poverty of the stimulus, a linguistic term used in language acquisition and development
 * Sayula Popoluca (ISO 639-3), an indigenous language spoken in Veracruz, Mexico

Music

 * P.O.S (rapper) (born 1981), or Stefon Alexander, American hip hop artist
 * Kelvin Mercer (born 1969), also known as Pos, member of the New York hip hop trio De La Soul
 * Pain of Salvation, Swedish progressive metal band
 * Paavo Siljamäki, Finnish DJ and producer, member of the English electronic group Above & Beyond. P.O.S is one of his aliases.

Places

 * Port of Spain, Trinidad and Tobago
 * Piarco International Airport (IATA code), Piarco, Trinidad and Tobago
 * Pomona–Downtown station (Amtrak station code), California, US

Science and technology

 * Political opportunity structure, an approach to explain social movements
 * Polycystic ovary syndrome, a disease of the ovaries
 * Probability of success, in statistics
 * Product of sums, a canonical form in Boolean algebra

Computing

 * P/OS, operating system of DEC Professional PCs from Digital Equipment Corporation
 * Packet over SONET/SDH, a communications protocol for transferring packets over fiber networks
 * PERQ Operating System, operating system for PERQ workstations
 * Proof of space, a cryptocurrency blockchain distributed consensus method
 * Proof of stake, a cryptocurrency blockchain distributed consensus method

Transportation

 * Post Office Sorting Van, a type of rail vehicle used in a Travelling Post Office train
 * SNCF TGV POS, a French high-speed train

Other uses

 * Phi Omega Sigma (disambiguation), a Greek name for any of five different student organizations
 * Piece of shit, a phrase considered vulgar and profane in Modern English
 * Point of sale, location where payment is accepted
 * Point of service plan, a type of managed care health insurance plan in the US
 * Polytechnic Secondary School (Polytechnische Oberschule), the 10-year general educational system in East Germany
 * Priory of Sion, a fictitious secret society
 * Public open space, a planning term for an outdoor public forum