School auxiliaries, for short

• Mom-and-pop groups, for short
• School-supporting orgs
• Elementary school organizations: Abbr
• School support grps
• Grps. that meet in the gym, maybe?
• School groups: Abbr.
• Sch. organizations
• NEA supporters
• Mom-and-pop grps

Wikipedia Word definitions in Wikipedia
PTAS or Ptas may refer to: Polynomial-time approximation scheme in computer science Pesetas , Spanish currency PTAS reduction , a reduction that is often used to perform reductions between solutions to optimization problems