What does 22 OBA stand for?

Hook Size 22 Olive Bodied Adams (fly fishing)

This definition appears very rarely

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21st Century Citizen (British Library) 21st Century Community Learning Center 21st Century Land Warrior 21st Century Land Warrior (Top Level Demonstration) 21st Century Land Warrior Top Level Demonstration 21st Century Land Warrior Top Level Demonstration 21st Century Network (BT Group, UK) Captain's command announcing system 21st Century Infrastructure Consortium Larceny from Business/Other (Alabama Public Safety Radio Code)		Second to None (dance group) 220 Mhz Spectrum Management Association of Southern California (amateur radio) Twenty Second Amendment .22 Long Rifle (ammunition) 2 to the third power (to the maximum, used on license plates) Larceny from Vehicle (Alabama Public Safety Radio Code) Twenty Third Amendment Larceny from Residence (Alabama Public Safety Radio Code) 24 Hours A Day for 7 Days A Week (Year Round) 24 hours a day, 7 days a week