POS, Pos or PoS may refer to:

Linguistics

Part of speech In grammar, a part of speech or part-of-speech (abbreviated as POS or PoS, also known as word class or grammatical category) is a category of words (or, more generally, of lexical items) that have similar grammatical properties. Words that are as ...

, the role that a word or phrase plays in a sentence *

Poverty of the stimulus Poverty of the stimulus (POS) is the controversial argument from linguistics that children are not exposed to rich enough data within their linguistic environments to acquire every feature of their language. This is considered evidence contrary to ...

, a linguistic term used in language acquisition and development *

Sayula Popoluca Sayula Popoluca, also called Sayultec, is a Mixe language spoken by around 5,000 indigenous people in and around the town of Sayula de Alemán in the southern part of the state of Veracruz, Mexico. Almost all published research on the language ha ...

(ISO 639-3), an indigenous language spoken in Veracruz, Mexico

Music

* P.O.S (rapper) (born 1981), or Stefon Alexander, American hip hop artist * Pain of Salvation, Swedish progressive metal band * Posdnuos (born 1969), or Kelvin Mercer, New York hip-hop artist

Places

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

Science and technology

* Political opportunity, 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