Cius

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Cius stands for several places in ancient geography:

Cius in Bithynia, later Prusias ad Mare , today Gemlik in Turkey
Cius in Moesia inferior, today Gârliciu in the Constanța district in the Romanian Dobruja

Also:

Titular Archbishopric of Cius , a titular archbishopric going back to Cius in Bithynia

CIUS stands for:

Core Invoice User Specification of the European standard EN16931 for electronic invoices, see XRechnung #Development of the standard