Oa

OA can mean:

Oficina Anticorrupción, an Argentine law enforcement agency.
Order of the Arrow, in the Boy Scouts of America.
Order of Australia, an Australian formal honour
Original Advocacy, in the National Forensics League.
Overeaters Anonymous, for Compulsive overeaters.
Olympic Airlines, the IATA code.
[ Onder Andere], is abbreviated to o.a. in the Dutch language; it means amongst others.
Old Alleynian, Old boy of Dulwich College.
Osteoarthritis, A degenerative disease of joints.
Obavještajna agencija, the Croatian Intelligence Agency.
o/a (also o.a. or oa), an abbreviation for overall, used when describing the length of a ship.

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