Memory Alpha
Memory Alpha

A holographic projection system, sometimes shortened to holo-projection system or simply projection system, was the system that made a holodeck function, consisting of a combination of various technologies, such as hologrids and holo-emitters, to create holograms.

According to The Doctor, his program could only appear in a room equipped with a holographic projection system. (VOY: "Future's End, Part II")

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