O3

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O3 can mean:

  • O3 (ozone)
  • O~3 Entertainment
  • O3 star, in stellar classification, the brightest subclass yet found of main sequence stars: an extreme end type O "blue dwarf" star.
  • "Once and Once Only" messaging (computer terminology), where a sender of a message across a network can repeat sending a message until it is acknowledged by the receiver and is guaranteed that the message is only processed by the receiver once, regardless of the number of attempts to send it.
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