cei

Initialism of Central European Initiative.

Initialism of Cycle Engineers' Institute, one of three screw thread standards contributing to the Whitworth threads standards set.

Initialism of cum-eating instructions: written or recorded instructions directing a submissive to consume semen.

Initialism of child exploitation images.

Past operations, such as those that took down the child exploitation site Playpen, or current efforts to arrest purveyors of CEI on Freenet, seek to chase out what one Dark Web site admin called the “true black sheep” of these networks.