a room equipped with a hologrid containing omnidirectional holographic diodes , enabling holographic projections
The Holographic Environment Simulator, an extremely realistic virtual reality space imagined by the writers of the "Star Trek" TV series. Holodeck "matter" and even holodeck people look, sound, and feel like the real thing. Star Trek crew members use the holodeck mostly for recreation and training and occasionally for fantasy, intellectual, or artistic expression.
In the Star Trek fictional universe, the holodeck is a virtual reality facility, generally on starships and starbases. Theorized by Janet Murray as a potential immersive environment in which cyberdramas are enacted. Integral to this procedural, participatory, immersive, and encyclopedic environment is the computer.