Cathode Ray Tube (CRT)
cath·ode ray tube
/ˈkaˌTHōd rā t(y)o͞ob/
a high-vacuum tube in which cathode rays produce a luminous image on a fluorescent screen, used in televisions and computer terminals.
For a product to be a video game, there must be a video signal transmitted to a cathode ray tube (CRT) that creates a rasterized image on a screen.