CI
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This can mean:
- The African nation of Côte d'Ivoire
- cI, the repressor cI protein.
- The postnominal of a Companion of the Order of the Crown of India
- Abbreviation for Confidential Informant
- Christmas Island, territory of Australia
- Kiritimati, another island by the name of "Christmas Island", and a Pacific atoll
- Cocos (Keeling) Islands, territory of Australia
- Cocos Island, offshore island of the Republic of Costa Rica
- the IATA code for China Airlines
- Composite Leading Indicator
- Configuration interaction, a post-Hartree-Fock method used in computational chemistry
Ci is
- the symbol for the Curie, a unit of radioactivity
- a form of Chinese lyric poetry
- abbreviation for the TV series Law_&_Order:_Criminal_Intent
- Tongyong Pinyin for Qi
- the symbol for the Cosine integral