Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym ONBT is...

ONBT is

  • Orbiter Neutral Buoyancy Trainer

ONBT is also in:

Acronym Definition Searched: BASS ABE AC 89017 BUG CPS SJC IRS USIP WKNG 58035 JHP CDG ASBO S&D