O3 may refer to:
Science and technology
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Ozone
Ozone () (or trioxygen) is an Inorganic compound, inorganic molecule with the chemical formula . It is a pale blue gas with a distinctively pungent smell. It is an allotrope of oxygen that is much less stable than the diatomic allotrope , break ...
(O
3), an allotrope of oxygen
*
, the ozonide anion
*
O(3), the 3-dimensional orthogonal group in group theory
* O3 star, a subclass of the
O-type star
An O-type star is a hot, blue star of spectral type O in the Yerkes classification system employed by astronomers. They have surface temperatures in excess of 30,000 kelvins (K). Stars of this type have strong absorption lines of ionised h ...
stellar classification
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Haplogroup O3 (Y-DNA), a Y-DNA Haplogroup
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OpenAI o3
OpenAI o3 is a reflective generative pre-trained transformer (GPT) model developed by OpenAI as a successor to OpenAI o1 for ChatGPT. It is designed to devote additional deliberation time when addressing questions that require step-by-step log ...
, an artificial intelligence model
Music
* ''O
3'', the 1993 debut album by the techno band
Sunscreem
* ''
O3 A Trilogy'', a 2008 concept album trilogy by progressive metal band Dominici
*
''O3'' (album), a 2008 album by Son of Dave
Military
* O-3, a
uniformed services pay grade of the United States for the following:
**
Captain (United States O-3)
Captain in the U.S. Army (), U.S. Marine Corps (USMC), U.S. Air Force (USAF), and U.S. Space Force (USSF) (abbreviated "CPT" in the and "Capt" in the USMC, USAF, and USSF) is a company-grade officer rank, with the pay grade of O-3. ...
, in the Army, Marine Corps, Air Force, and Space Force
**
Lieutenant (navy)
LieutenantThe pronunciation of ''lieutenant'' is generally split between , , generally in the United Kingdom, Ireland, and Commonwealth countries, and , , generally associated with the United States. See lieutenant. (abbreviated Lt, LT (U.S. ...
, 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
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Oldershaw O-3, a glider
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Otoyol 3
Otoyol 3 (), also known as the European Motorway () and abbreviated as the O-3 is a long otoyol in East Thrace, Turkey. The O-3 runs from Edirne to Istanbul and is the only motorway in Turkey located entirely in Europe. The motorway begins west ...
, a Turkish motorway from Edirne to Istanbul
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LNER Class O3, a class of British steam locomotives
Other uses
* Oskarshamn 3, unit 3 at
Oskarshamn Nuclear Power Plant
The Oskarshamn Nuclear Power Plant is one of three active nuclear power stations in Sweden. The plant is about north of Oskarshamn, directly at the Kalmarsund at the Baltic Sea coast and with one active reactor, producing about 10% of the elec ...
in Sweden
See also
*
03 (disambiguation) 03 may refer to:
__NOTOC__
* The year 2003, or any year ending with 03
* The month of March
* 3 (number)
Music
* ''03'' (Twelve album), 2007
* ''03'' (Urban Zakapa album), 2013
Other uses
* 03 numbers, a non-geographic telephone number range i ...
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Ö3, Austrian radio station
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3O (disambiguation)
{{Letter-NumberCombDisambig