tick-tack

/T IH1 K T AE0 K/
noun
  1. 1

    A system of sign language used by bookmakers at racecourses to communicate odds and bets; an associated group of words for each sign

noun
  1. 1

    The sound of repeated tapping, knocking, or clicking.

  2. 2

    A device used to tap on a window or door from a distance.

Source: https://en.wiktionary.org/wiki/tic-tac, https://en.wiktionary.org/wiki/tick%20tack, https://en.wiktionary.org/wiki/tick-tack