closed-circuit television

 

English Wikipedia has an article on:

closed-circuit television

Wikipedia

closed-circuit television (countable and uncountable, plural closed-circuit televisions)

1. A system of television cameras, connected by cable to a control room, used for surveillance.
   • 1963 January, “News and comment”, in Modern Railways, page 14:

     Holborn Underground Station, on London Transport's Piccadilly and Central Lines, has been equipped with closed-circuit television to help control passenger movement.

• CCTV