What does PTSA stand for?

Kusaie - Caroline Islands - ICAO location identifier (ICLI)

Para-Toluenesulfonamide (SAUS)

Para-Toluenesulfonic Acid - Organic chemistry

Para-Toluene Sulphonic Acid (SAUS)

Parent-Teacher Student Association (SAUS)

Parent-Teacher-Student Association - Nickname: "Pizza"

Piano Trade Suppliers' Association - British (BI)

Professional Trucking Services Association (EA)