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Meanings and definitions for O3

O3, the molecular formula for ozone
O3, the 1993 debut album by the techno band Sunscreem
O3 A Trilogy, a 2008 concept album trilogy by progressive metal band Dominici
O3 star, in stellar classification, a subclass of type O stars
O-3, the pay grade for the following officer ranks in the U.S. uniformed services: Captain in the Army, Air Force, and Marine Corps
Lieutenant in the Navy, Coast Guard, Public Health Service Commissioned Corps, and NOAA Commissioned Officer Corps
O3 Entertainment, a video game publisher
Haplogroup O3 (Y-DNA), a Y-DNA Haplogroup
Oldershaw O-3, glider
USS O-3 (SS-64), a 1917 United States O class submarine
Otoyol 3, a Turkish motorway from Edirne to Istanbul
Oskarshamn 3, unit 3 at Oskarshamn Nuclear Power Plant in Sweden
O3 (album), a 2008 album by Son of Dave
Ö3, Austrian radio station
The year 2003, or any year ending with 03
The month of March
03 (Twelve album), 2007
03 (Son of Dave album), 2008
03 (Urban Zakapa album), 2013
3 (number)
3, Triq ix-Xatt, a nineteenth-century building in Marsaskala, Malta
03 numbers, a non-geographic telephone number range in the UK
The number of the French department Allier
The occupational field designator for U.S. Marine Corps Infantry
3J, IATA code for Jubba Airways
3O, IATA code for Air Arabia Maroc
3o Sector, see Tertiary sector of the economy
3o Gymnasio Agias Paraskevis, see 3rd Gymnasium of Agia Paraskevi
3-O-sulfation, a phenomenon occurring in Heparan sulfate