Holomatrix
The holomatrix was the programming code for holographic software such as holonovels, the Emergency Medical Hologram, and other holoprograms. (TNG; DS9; VOY)

Holomatrices could, by its nature, hold more information than standard transmissions of the same size. ()

It was also a term used to refer to the hologrid, the systems used to project holographic images on the holodeck.

By the 29th century, the term holomatrix was used to refer to that century's equivalent to a holodeck. Braxton had Seven of Nine report to Holomatrix 1 aboard the  to run a simulation of her mission aboard  to remove a temporal disruptor. ()

de:Holomatrix
Holographic technology