What does O/A stand for?

MLA style: "O/A." Acronym Finder . 2013. AcronymFinder.com 19 May. 2013 http://www.acronymfinder.com/On-or-After-(O%2fA).html
Chicago style: Acronym Finder . S.v. "O/A." Retrieved May 19 2013 from http://www.acronymfinder.com/On-or-After-(O%2fA).html
APA style: O/A. (n.d.) Acronym Finder. (2013). Retrieved May 19 2013 from http://www.acronymfinder.com/On-or-After-(O%2fA).html

On or After

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Optical Service Level Agreement Optical Service Level Specification Optical Subnetwork Connection Protection (fiber optics) Ocala's Serious Traffic Offenders Program Observer-Target Optical Time Division Multiplexing (usually seen as OTDM) Oakland, California Ordered Back Obligational Authority On Or About		Operating As (legal entity term) Operations/Administrative Ordnance Alteration Outside Air Octanol/Buffer (biopharmaceuticals) On Behalf On Board Oxymorphone-Bupivacaine (drug combination) Object Classification Observer/Collector