Examples from the Web for oa
Africom had been assigned three two-letter ranges to choose from: JS through JZ, NS through NZ, and OA through OF.Why Is the Libya War Called Operation Odyssey Dawn?|Josh Dzieza|March 22, 2011|DAILY BEAST
The encounter with Oa had given her a feeling that dangers lurked out in the deep water, to which she was by no means equal.
The wild weather puts life into Oa; it brings her great opportunities.
The whole area now generated is therefore twice the area of this sector, or equal to OA.