Big O
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Big O can refer to any of:
- A concept in computational complexity theory. See Big O notation.
- A Japanese anime series. See Big O (anime).
- A euphemism for orgasm.
- The 1976 Summer Olympic Stadium in Montreal, Quebec.
- Oscar Robertson, a basketball player.
- Big O Tires, a tire company in the United States.
- The Big O, a Roy Orbison album, or Roy Orbison himself.