O1

O1 or O-1 may refer to:

Aircraft

• O-1 Bird Dog, an observation aircraft manufactured by Cessna
• O-1 Falcon, an observation aircraft manufactured by the Curtiss Aircraft Company
• O-1 Airship, an Italian manufactured semi-rigid airship operated by the US Navy

Military

• NATO Rank O-1
• USS O-1 (SS-62), lead ship of the United States O class submarines
• edit] Other
  • O1 star, a subclass of O-class stars
  • O-1 tool steel, a type of oil-hardening tool steel
  • O-1 visa
  • Haplogroup O1 (Y-DNA), a Y-DNA haplogroup
  • SP&S Class O-1, a steam locomotives class
  • Otoyol 1, a Turkish highway around Istanbul
  • Ö1, an Austrian radio station
  • O1 Communications, Inc., a California telecommunications company

  See also

  • 01 (disambiguation)

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