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

SIY is

  • Siskiyou Airport Yreka, Yreka Rohner Field, Montague, California USA

SIY is also in:

Acronym Definition Searched: SCRA HALO UC F 44857 LS 88421 3S2 DFE ILS 33898 MCT AMA 12Y SLT