PSO

plural PSOs

1. abbreviationcountableinitialismuncountableInitialism of public safety officer.
2. AustraliaabbreviationcountableinitialismuncountableInitialism of protective services officer.
3. abbreviationcountableinitialismuncountablehobbiesInitialism of penalty shootout.
4. abbreviationcountableinitialismuncountableastronomyInitialism of protostellar object.
5. abbreviationcountableuncountablemedicineAbbreviation of psoriasis.
6. abbreviationcountableinitialismuncountablecomputer graphicsInitialism of pipeline state object.

1. PakistanabbreviationinitialismInitialism of Pakistan State Oil.
2. abbreviationinitialismvideo gamesInitialism of Phantasy Star Online.

   The turn-based card-battler is set in the expansive PSO universe, and the action will take place both online and offline.

   2004 January 28, “Game Watch”, in Nintendo Power, number 175, page 20

   2 more examples

   Next up, graphics: this is early DC territory, looking like Nomad Soul. Up against the likes of PSO, it looks horrifically dated.

   2002 April 28, “Dragon Riders: Chronicles of Pern”, in Game Master, number 119, page 104

   Taking place prior to the events of the Ambition of the Illuminus Expansion Pak, Phantasy Star Portable may be the direct descendant of PSU in terms of time and space, but the hypnotic soundtrack and overall feel are pure PSO (with a CPU party, ahem) affixed to a vastly improved version of PSU's base foundation.

   2009 May 28, Dave Halverson, “Phantasy Star Portable”, in PLAY, number 89, page 57

plural PsOs

1. abbreviationcountableuncountablemedicineAbbreviation of psoriasis.