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SOS
+++++ silicon-on-sapphire
++++- Somali shilling
+++-- save our souls
AcroLexic: Dictionary of Acronyms and Abbreviations contains 25 more definitions of “SOS”.
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See also

Acronym Definitions
ASOS 4
SOSC 3
PESOS 2
MSOS 2
SOSG 2
ISOS 2
DISSOS 1
DISOSS 1
NCSOS 1
ERSOS 1
ISOST 1
SOSUS 1