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'o/a', 'o.a.' or 'oa' can refer to:

★ an abbreviation for 'overall', and is used when describing the length of a ship. This term refers to the maximum length of a vessel from the two points on the hull most distant from each other, measured perpendicular to the waterline.

★ an abbreviation for 'on or about' used in US military and government correspondence, as in "it happened o/a 22:30".

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See also

See also

★ p/p: between perpendiculars length

★ w/l: waterline length