OO, O_O or variants may refer to:
Arts and entertainment
*
''OO'' (EP), by Zion.T, 2017
* OO, production code for the 1967 ''Doctor Who'' serial ''
The Ice Warriors''
*
"O.O" (song), by Nmixx, 2022
Places
*
Oô, France
*
Oo, Indonesia
Science and transportation
*
Ōō, an extinct bird of the genus ''Moho''
*
SkyWest Airlines, IATA airline code OO
* OO,
the aircraft registration prefix for Belgium
*
Old Oak Common TMD, England, carriage shed depot code OO
Other uses
* several
emoticon
An emoticon (, , rarely , ), short for emotion icon, is a pictorial representation of a facial expression using Character (symbol), characters—usually punctuation marks, numbers and Alphabet, letters—to express a person's feelings, mood ...
s
*
, a Latin-script digraph
* , a ligature of the Latin script.
* Oo stick, a traditional Hawaiian digging bar
A digging bar is a long, straight metal bar used for various purposes, including as a post hole digger, to break up or loosen hard or compacted materials such as soil, rock, concrete and ice or as a lever#First class levers, lever to move objects ...
* Original Oratory, a competitive event in high school forensic competitions
* OO gauge, a model railway standard
* Official Observer, an appointed amateur radio operator
* Oo Zun (1868–1944), Burmese social worker and Buddhist nun
* Tin Oo (1927–2024), Burmese politician, activist and military
See also
* Double O (disambiguation)
* 00 (disambiguation)
* 0-0 (disambiguation)
* O0 (disambiguation)
* OOO (disambiguation)
* , infinity symbol
* ᅇ, an obsolete unit of the Hangul alphabet
* ⚭, marriage
Marriage, also called matrimony or wedlock, is a culturally and often legally recognised union between people called spouses. It establishes rights and obligations between them, as well as between them and their children (if any), and b ...
symbol
* ⱺ, a phonetic character
* Object-oriented programming
Object-oriented programming (OOP) is a programming paradigm based on the concept of '' objects''. Objects can contain data (called fields, attributes or properties) and have actions they can perform (called procedures or methods and impl ...
, a computer programming paradigm
* Orange Order
The Loyal Orange Institution, commonly known as the Orange Order, is an international Protestant fraternal order based in Northern Ireland and primarily associated with Ulster Protestants. It also has lodges in England, Grand Orange Lodge of ...
, a protestant fraternal order in Northern Ireland
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