In cricket, a "leg bye" is a type of extra. Wikipedia

In cricket, a run scored by the batting team when the the ball has hit the batsman's body or protective gear rather than the bat Wikidata

A run scored by a batting side arising from the ball striking any part of the batsman's body (other than the hand) without touching the bat. Leg byes are recorded as extras and do not affect the batsman's individual score. A leg bye can only be scored if the batsman was genuinely attempting to play a shot, or genuinely tried to avoid being hit by the ball. Wiktionary