cue

(noun) an actor's line that immediately precedes and serves as a reminder for some action or speech.

(noun) evidence that helps to solve a problem. Synonyms: clue, clew.

(noun) a stimulus that provides information about what to do. Synonyms: discriminative stimulus.

(noun) sports implement consisting of a tapering rod used to strike a cue ball in pool or billiards. Synonyms: cue stick, pool cue, pool stick.

(verb) assist (somebody acting or reciting) by suggesting the next words of something forgotten or imperfectly learned. Synonyms: prompt, remind.