English abbreviations from o to o8
- O(Oberst||Observer||Obstacle||Octal||Officer||Official||Oh||Operational||Operator||Oprah (magazine)||Outstanding|| Oxygen)
- O.(Hora ("Hour"); Obiit ("Died"))
- O/B(Outboard)
- O&C(Operation and Checkout)
- O/C(Observer/Collector)
- O&G(Oil and Gas)
- O&I(Operations and Intelligence)
- O+I(Outings and Innings)
- O&M(Operations and Maintenance)
- O&O(Operational and Organizational)
- O&OP(Operational and Organizational Plan)
- O&S(Operations and Support)
- O/S(Operations and Support life cycle phase)
- O1(Officer grade: Ensign or 2nd Lieutenant)
- O10(Officer grade: Admiral or General)
- O11(Officer Grade: Fleet Admiral Or General of the Army)
- O2(Object Oriented)
- O2I(Object-Oriented Interface)
- O3(Ozone)
- O3O(O3o)
- O4(Officer grade: Captain or Colonel)
- O5(Officer grade: Commander or Lieutenant Colonel)
- O6(Officer grade: Captain or Colonel)
- O7(Officer grade: Commodore, Rear Admiral (Lower Half), or Brigadier General)
- O8(Officer grade: Rear Admiral (Upper Half), or Major General)
