O4
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Template:Sister project O4 may refer to:
- LNER Class O4, a class of ex-Great Central Railway 2-8-0 steam tender locomotives
- Taff Vale Railway O4 class, a class of 0-6-2T steam tank 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 in the Army, Marine Corps, Air Force, and Space Force
- 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
- O(4)Script error: No such module "Check for unknown parameters"., the orthogonal group in dimension 4
- 0-4 = Riley Vandergrift’s collegiate record against the University of Michigan