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What does SIOS stand for?

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Rank Abbr.Meaning
SIOSStatus Indication Out of Service (SS7)
SIOSServizio Informazioni Operativo e Situazione (Italian defense secret service; one for each Italian military service)
SIOSSociety for Indian Ocean Studies (est. 1987)

Note: We have 6 other definitions for SIOS in our Acronym Attic