silver box

English

Noun

silver box (plural silver boxes)

1. (telephony) A modified DTMF box that adds four additional keys, creating a four-column-by-four-key grid.

Coordinate terms

(colored boxes, especially electronic ones):

• beige box
• black box
• blue box
• brown box
• gray box
• green box
• orange box
• purple box
• red box
• silver box
• white box
• yellow box