Initialism of Crime Scene Investigation (a term of forensic science). / (informal, US) Initialism of Crime Scene Investigator. / Initialism of Customer Satisfaction Index.

Initialism of Committee for Skeptical Inquiry (formerly CSICOP) / (India) Initialism of Computer Society of India.

(Canada) Acronym of Canadian Security Intelligence Service.

plural of CSI

The Committee for the Scientific Investigation of Claims of the Paranormal. Former name of Committee for Skeptical Inquiry.

(military, US) Initialism of Combat Service Identification Badge.

(microelectronics) Initialism of Customer-Specified Integrated Circuit.

plural of CSIB

plural of CSIC