Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym 21G is...

21G is

  • Marblehead Coast Guard Station / Weather Observation Station, Marblehead, Ohio USA

21G is also in:

Acronym Definition Searched: MTOR 06750 OBPS (CDER) TSI SLAC SOB WBMS KIDS SHA POI 95569 SOES SK STEM WBE