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

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

Original poster or original post, a term used on online forums to denote the first poster/post
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

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

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