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

21B is

  • Mount Desert Coast Guard Lifesaving Station / Weather Observation Station, Southwest Harbor, Maine USA

21B is also in:

Acronym Definition Searched: EAL PLN 62418 FTMR WLT OWA 17942 61613 IAM 39117 AIS GMC BSA CFF PLM