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The length is commonly used in Thoroughbred horse racing, where it describes the distance between horses in a race. Horses may be described as winning by several lengths, as in the notable example of Secretariat, who won the Belmont Stakes by 31 lengths (248 feet (76 m)). More often winning distances are merely a fraction of a length, such as half a length.
Distances smaller than that are similarly described in reference to the equine body with terms such as a "neck", and a "head", a "short head" or "nose", the smallest possible named advantage by which a horse can win. In the United Kingdom and Ireland a margin of more than 30 lengths is described as a "distance". In France the term "short neck" is used for a margin intermediate between a head and a neck. Harness race finishing margins are typically measured in meters.
These terms are used in other disciplines of equestrianism as well, particularly useful as a guide for riders in spacing animals apart when a number of them are all together in a riding arena, such as during group riding instruction or at a horse show.
In reporting result of horse races winning margins are commonly abbreviated:
|Half a length||½L|
|Three-quarters of a length||¾L|