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Meanings and definitions for O4
What does O4 stand for? What does O4 mean?
- LNER Class O4, a class of ex Great Central Railway 2-8-0 steam tender locomotives
- USS O-4 (SS-65), a 1917 United States O class submarine
- O-4, the pay grade for the following officer ranks in the U.S. uniformed services:
Major (United States) in the Army, Air Force, and Marine Corps
- Lieutenant Commander in the Navy, Coast Guard, Public Health Service Commissioned Corps, and NOAA Commissioned Officer Corps
- Tetraoxygen (O4), oxozone
- a class of stars in the stellar classification
- Otoyol 4, a highway from Istanbul to Ankara, Turkey
- Martin XO-4, an observation aircraft proposed by the Glenn L. Martin Company
- The year 2004, or any year ending with 04
- The month of April
- 4 (number)
- 04 (Six by Seven album)
- 04 (Urban Zakapa album)
- 04, department number of Alpes-de-Haute-Provence, France
- Several German football teams, e.g. Bayer 04 Leverkusen, FC Ingolstadt 04, 1. FC Neubrandenburg 04, FC Schalke 04
- 4° (also 4o), an abbreviation for Quarto
- 4 Degrees and Beyond International Climate Conference, discussing issues involving a 4 °C rise in average global surface temperature
- 4o Sector, see Quaternary sector of the economy
- 4O, IATA code for Interjet
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