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Library cataloging and classification
main topic	sport
Colon	MY
Dewey Decimal	796
Library of Congress	GV
Universal Decimal	796/799

Wikimedia Commons has media related to Sports.

A sport consists of a physical activity or skill carried out under a publicly agreed set of rules, and with a recreational purpose: for competition, for self-enjoyment, to attain excellence, for the development of skill, or some combination of these. The difference of purpose is what characterises sport, combined with the notion of individual (or team) skill or prowess.