In field events, or heptathlon/decathlon, it means "no mark".
relay means a race but the race is a short one
track and field track and field
Track And Field
track and field
History of Track and Field
P.R. means personal record. the term is used often
Track and field started in 776BC in Greece.
No, chess is not a track and field game.
In track and field, measurements are done in meters.
Track and field is called d'Athlétisme in French.
GJ Tiari is 5' 5".