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What does SION stand for?

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Rank Abbr.Meaning
SIONStandard Input Output Norms (Director General of Foreign Trade; India)
SIONSolent Investment Opportunity Network (Portsmouth, UK)
SIONStuurgroep Integraal Overlandvliegen Nederland (Dutch: Steering Group Cross Country Flying Netherlands)
SIONShut in Over Night (oil drilling)

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