Tic-tac is the secret and complex sign language used by bookmakers at racecourses to indicate movements in the price of a horse.
Those plying this skill usually wear white gloves and stand on wooden crates so they can be easily seen.
The signs are further encoded by use of what is known as the 'twist card' which jumbles the racecard numbers for use by specific firms.
Most prices are also known by slang, as in the case of Burlington Bertie 100-30. Or scruffy and dirty, one hundred to thirty.
Click on the odds shown above to enter the mysterious world of tic-tac.
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