The two major archery associations have a bit different definitions for longbow. World Archery (WA) rules say that longbow should have traditional look and string not touching belly outside nock grooves, i.e. some slight recurve allowed. Length of the bow should be 160 cm or more (for male archers). International Field Archery Association (IFAA) rules say there must not be any reflex outside handle area when bow is stringed, i.e. limb line should form D.