The term 'screen signal' can refer to a variety of different technologies, such as a visual or audio signal that is used to alert a user of an incoming message or notification. In this particular crossword, the solution for the term 'screen signal' is 'BLIP', which is a short, sharp sound or light that is used to indicate a change in status or to draw attention. Blips are commonly used in computer and video games, as well as in other digital media.