O3

Look up O₃ in Wiktionary, the free dictionary.

O3 may refer to:

Science and technology

Ozone (O₃), an allotrope of oxygen
O³⁻, the ozonide anion
O(3), the 3-dimensional orthogonal group in group theory
O3 star, a subclass of the O-type star stellar classification
Haplogroup O3 (Y-DNA), a Y-DNA Haplogroup
OpenAI o3, an artificial intelligence model

Music

O₃ (album), by Sunscreem, 1993
O3, a 2008 album by Son of Dave
O3 Trilogy, a series of albums by Dominici

Military

O-3, a uniformed services pay grade of the United States for the following:
- Captain (United States O-3), in the Army, Marine Corps, Air Force, and Space Force
- Lieutenant (navy), in the Navy, Coast Guard, Public Health Service Commissioned Corps, and NOAA Commissioned Officer Corps
USS O-3 (SS-64), a 1917 United States O class submarine

Transportation

Oldershaw O-3, a glider
Otoyol 3, a Turkish motorway from Edirne to Istanbul
LNER Class O3, a class of British steam locomotives

Other uses

Oskarshamn 3, unit 3 at Oskarshamn Nuclear Power Plant in Sweden

See also

03 (disambiguation)
Ö3, Austrian radio station
3O (disambiguation)

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