Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym GLA21 is...

GLA21 is

  • Geophysics Luminous Aurora-like Phenomena: Auroras and Surface Fogs

GLA21 is also in:

Acronym Definition Searched: MARCS OT WWOP MPR 73760 WPA LFAI CJMT DIANA 72524 WARN JC MRSL CCN OB