Acronym
or Word

P.A.D.I
B.S.A.C
S.C.U.B.A

Meaning or
Description

Professional Association of Diving Instructors
British Sub Aqua Club
Self Contained Underwater Breathing Apparatus

Alternate meaning or
AKA  (also known as)

Put Another Dollar In, Pay and Dive.
Buy Substandard And Cheap.
Diving, Scuba Diving.