Tic
Simple motor tics are typically sudden, brief, meaningless movements that usually involve only one group of muscles, such as eye blinking, head jerking, or shoulder shrugging. Motor tics can be of an endless variety and may include such movements as hand clapping, neck stretching, mouth movements, head, arm or leg jerks, and facial grimacing.
Tic-tac
Tic-tac (also tick-tack and non-hyphenated variants) is a traditional method of signs used by bookmakers to communicate the odds of certain horses. Until the turn of the 21st century it was a very common sight on racecourses in the UK, but with the advent of mobile technology it is now seldom seen. In 1999, only three practitioners were noted to be still working on the southern UK tracks – Micky 'Hokey' Stuart, Billie Brown and Rocky Roberts. A tic-tac man will usually wear bright white gloves to make his hand movements easily seen.