Definition: numbers that are written in black in on the shoulders, shoulder blades and wrists of the swimmers for identification purposes. These numbers are used to monitor the swimmer's progress, announce the swimmer's position to the crowd and media, and to inform swimmers who commit rule infractions during the race. (noun)
Also Known As: race numbers, competitor's numbers
Examples:
The race officials write markings on the swimmer's shoulders 30 minutes before the start of the race.
