OP

OP, O.P., or Op may refer to any of the following:

• Observation post, a position from which soldiers can watch enemy movements
• Ocean Pacific, a retail company based in California, United States
• Orange pekoe, a term used in the Western tea trade to describe a particular grade of black teas
• Orange peel, the outer layer of an orange fruit
• Ordo Praedicatorum, commonly known as the Dominican Order, a Catholic religious order
• Operating Procedure, a standardised working protocol
• Operating Profit, a measure of business profitability
• Out of print, a status of a book title at a publishing house
• op, a slang term for marijuana grow operation
• op, Open pollination

Mathematics

• Operator (mathematics), a mapping from one vector space or module to another
• Op (statistics), a symbol used in probability mathematics
• Octagonal prism, a prism formed by square sides and two regular octagon caps

Culture

• Op art, also known as optical art, a style of visual art that makes use of optical illusions
• Op-ed, a newspaper opinion piece of a writer unaffiliated with the editorial board
• Opposite prompt, the right side of a theatre stage
• Op., an abbreviation for Opus number, used to denote one work of musical composition from many
• Op. cit., an abbreviation for the Latin term opus citatum est, meaning "the work has been cited"
• Optimus Prime (Transformers), a character from the Transformers franchise
• One Piece, a Japanese manga and anime created by Eiichiro Oda
• a shortening for Opening credits, more often used in anime by fans

Computing

• Original poster, a term used on online forums to denote the first poster
• Overpowered, a term used to note that a particular aspect or character in a game is unbalanced and thereby too strong.
• Overpriced, a term used mostly on online games to note about an item that is being marketed for a price higher than normal
• a channel operator on an Internet Relay Chat

Education

• Oratory Preparatory School, a Catholic preparatory day school for boys in New Jersey, United States
• Overall Position, the grade appointed to Queensland high-school graduates
• Old Persean, an ex-pupil of the Perse School, Cambridge, England
• Old Pauline, an ex-pupil of St Paul's School, London
• Old Pangbournian, an ex pupil of Pangbourne College

Geography

• Oak Park, Illinois, a village west of Chicago, United States
• Oakland Park, Florida, a city in the Fort Lauderdale Metropolian Area
• Orchard Park, New York, a town south of Buffalo, New York, United States
• Overland Park, Kansas, a city in the Kansas City Metropolitan Area

Science and medicine

• the Oropharyngeal airway, leading from the mouth to the pharynx
• Organophosphate, the general name for esters of phosphoric acid
• Osteitis pubis, a medical condition which is prevalent among players of Australian rules football
• Osteoporosis, a degenerative disease of the bones that leads to an increased risk of fracture
• a short-hand slang term for a surgical operation

See also

• OPS (disambiguation)