PSO

Pakistan State Oil
Particle Swarm Optimization - a swarm intelligence optimization technique
Paysite operator - the owner/operator of a paysite
Phantasy Star Online - a video game
Phone sex operator - a person who provides phone sex service
Pittsburgh Symphony Orchestra
Peace Support Operations An international collection of armed forces intended to observe peace generally under UN auspices.
Protocol Support Organization - one of the three initial components of ICANN, later disbanded.
Public Service Obligation - a form of state subsidy for transport links which are not commercially viable
Phonic Sonic Oradea - electronic music community of Oradea
Penalty shootout - a method of determining a winner in sports matches which would have otherwise been drawn or tied

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