GCI

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GCI stands for:

Global Commons Institute , a British climate protection organization
Global Competitiveness Index , growth competitiveness index calculated by the World Economic Forum

Great Coasters International , a manufacturer of wooden coasters
Green Cross International , see International Green Cross
Google Code-in , a student competition
Guernsey , Channel Islands , FIDE code
Guernsey Airport (IATA code)

GCi stands for:

Gigacurie , corresponding to 10 ⁹ curies (unit) , obsolete unit of the activity of a radioactive substance