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: HRTN SATURN MCM MCIPS 84028 35295 GLFD WGM PTA ANCM 77465 AS SSO STARFISH PAO