set-top box

n.

A device that enables a television set to receive and decode digital television (DTV) broadcasts or enables a television set to become a user interface to the Internet.

DTV set-top boxes are sometimes called receivers.

Acronym: STB

V-chip

n.

A computer chip installed in a television to allow the user to control the display of certain programs, especially of sexual or violent content.

remote control

n.

An electronic device that can be used to control a machine or apparatus from a distance.

Short form:

remote

Synonym:

controller, flipper, clicker, changer.