OOP may refer to:

• Object-oriented programming, a computer programming paradigm
• Order of operations, in arithmetic and algebra, certain rules used for the order in which the operations in mathematical expressions are to be evaluated
• Out of print, a term referring to an item, typically a book, but can include any print or visual media or sound recording, that is no longer being published.

This article is becoming very long. ... In arithmetic and algebra, certain rules are used for the order in which the operations in expressions are to be evaluated. ...

See also

• OOPS

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The time of the month when leaves fall most often. OOPS can refer to Open Ocean Performance Sixties Object-oriented programming (or production) system Out-of-Plane Spectrometer A vocal reaction to a mistake or error Out Of Phase Stereo A Linux kernel oops A phrase that is said when someone does something by accident. ... Image File history File links Disambig_gray. ...