A sky box is a type of television receiver that allows users to access satellite or cable television services. It is also known as a set-top box, and it is typically used in conjunction with a television set. The term 'sky box' is derived from the fact that it is often used to receive signals from satellites in the sky. The crossword solution for the term 'sky box' is 'KITE, ' which is a four-letter word. Kites are objects that are flown in the sky, and they are often associated with the idea of a sky box.