What does BAPA stand for?

Barred Parakeet - Common English name - Scientific name: Bolborhynchus Lineola - American Ornithologists Union four-character bird identification (IBP)

Benzoylarginine p-Nitroanilide - Also, BAPNA - Biochemistry

British Adult Publications Association (SAUO)

British Aeromedical Practitioners Association (DA)

British Amateur Press Association (BI)