I didn't know what a PSO was either; so here are the choice. I am betting on number 1.
Acronym Definition
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PSO Phantasy Star Online
pso psoriasis
PSO Penalty Shoot-Out (football / soccer)
PSO Particle Swarm Optimization
PSO Public Service Obligation (chiefly European)
PSO Professional Services Organization
PSO Pakistan State Oil
PSO Phone Sex Operator
PSO Protocol Supporting Organization (ETSI, IETF, ITU, W3C Consortium)
PSO Portland Symphony Orchestra (since 1923; Portland, Maine)
PSO Project Support Office (project management)
PSO Peace Support Operation
PSO Provincial Sport Organization (Canada)
PSO Provider Sponsored Organization
PSO Public Safety Officer
PSO Public Service of Oklahoma
PSO Program Secretarial Officer
PSO Password Settings Object
PSO Principal Scientific Officer
PSO Port Security Officer
PSO Parent Support Organization
PSO Process Sign-Off
PSO Post Secondary Option (education)
PSO Polycystic Ovary Syndrome
PSO post security officer (US DoD)
PSO Paralegal Society of Ontario
PSO Pasto, Colombia - Cano (Airport Code)
PSO Participating Standards Organization
PSO Piano-Shaped Object (shoddily made or badly damaged piano)
PSO Portsmouth Symphony Orchestra (Portsmouth, OH)
PSO Procurement Support Office
PSO Project Safety Officer
PSO Pressure Shut Off
PSO Pembroke Symphony Orchestra (Canada)
PSO Personal Service Organization
PSO Peter Skene Ogden Secondary (school)
PSO PlayStationOne
PSO Partner Solution Offering (Dell)
PSO Product Support Office
PSO Production Sign Off
PSO Product and Service Offer
PSO Permanent Slow Order (railway)
PSO Protectseniors.org (Washington, DC lobby)
PSO Primary Strike Objective
PSO Primary Standardization Office
PSO Program Staff Office/Officer
PSO Provisions Supply Office
PSO Proud Social Outcast
PSO Preliminary Screening Officer
PSO Processing Services Operation (Sprint)
PSO Possible Survivable Options
PSO Project Step Off
PSO Payload Sensor Operator
PSO Policy Service Office (insurance)
PSO Primary Support Official
PSO Plan for Safe Operation
PSO Parma Symphony Orchestra (Parma, OH)
PSO Polysporin Ointment
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