What does APER stand for?

Air Pollutant Emissions Report - Environmental Protection Agency

Air Pollution Emissions Report (SAUS)

Antipersonnel - Projectile

Aperient - Pharmacy (ROG)

Aperture

Association of Publishers' Educational Representatives - British

Atlantic Permanent Savings Bank F.S.B. (Virginia) - NASDAQ symbol (COMM)

Aperture (ADWA)