PSO

PSO (countable and uncountable, plural PSOs)

1. Initialism of public safety officer.
2. (Australia) Initialism of protective services officer.
3. (sports) Initialism of penalty shootout.
4. (astronomy) Initialism of protostellar object.
5. (pathology) Abbreviation of psoriasis.

   Alternative form: PsO

6. (computer graphics) Initialism of pipeline state object.

(protostellar object):

• YSO (young stellar object)
• SSO (substellar object)
• QSO (quasistellar object)

PSO

1. (Pakistan) Initialism of Pakistan State Oil.
2. (video games) Initialism of Phantasy Star Online.
   • 2002 April, “Dragon Riders: Chronicles of Pern”, in Game Master‎^[1], number 119, page 104:

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

   • 2004 January, “Game Watch”, in Nintendo Power‎^[2], number 175, page 20:

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

   • 2009 May, Dave Halverson, “Phantasy Star Portable”, in PLAY‎^[3], number 89, page 57:

     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.

     v

• sop, -spo, OPS, OPs, SOP, POS, ops, Ops, SPO, OPS+, S.O.P., pos, PoS, /pos, POs