Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym O5 is...

O5 is

  • Österreich (Austrian) Resistance Group

O5 is also in:

Acronym Definition Searched: BOB NRN 79913 87029 ADEC GMC 54964 80601 TCM AIT 47396 MCSO OCH WLA SKL