In cricket, LB indicates a Leg Bye, one such rare way in which the batting side scores runs when the ball actually does not touch the bat. Leg byes happen when the ball hits any part of the batter’s body other than the hand holding the bat, and the batters run between the wickets. These runs are added to the extras, meaning they contribute to the total team score but do not go to the batter’s personal statistics.
Understanding the Concept of Leg Byes

Leg byes fall under the category of extras, with wides, no-balls, and byes also belonging to that list. The extras are given when a delivery hits the batter legally on the body or the protective gear (like pads), and the batters complete a run or two. Even though the runs are made by the batter running, they are regarded as either mistakes from the fielding side or lucky outcomes, not runs made through skill.
Unlike the runs made off the bat, leg byes depend mainly on how quickly the fielding team reacts and tries to prevent those extra runs. This makes leg byes a very exciting aspect of tactics because chance runs alongside awareness and speed.
Not in every circumstance when the ball hits the batsman’s body will leg byes be awarded. Some conditions must be fulfilled for leg byes to be awarded:

Legal Delivery: One such condition is that the ball must be legal, that is to say, it cannot be a no-ball.
Attempted Shot or Avoidance: There must have been a deliberate attempt by the batter to play a shot; alternatively, the batter may have taken evasive action to avoid being hit by the ball.
The umpire’s discretion: If the umpire believes that the batter neither tried to play the ball nor move away from it, the umpire may call a “dead ball,” in which case no runs would be allowed.
The said conditions make leg byes more fair and preclude any intentional padding of a ball by batters as a means of collecting easy runs.
How Does the Umpire Indicate Leg Byes?

If the umpire awards leg byes, they will signal it by resting one hand on the raised knee of the other leg. This distinctly reveals to players, scorers, and spectators that the runs meted out are from leg byes and thus distinguishes it from other extras like byes or wides. The uniform application of these signals helps maintain transparency and consistency with scoring, applying across all levels of the game.
Strategic Value of Leg Byes
Drawn to our attention are Leg byes and their seemingly minor roles, which more often than not, determine a match’s result in a close contest. Rapid running between the wickets and good communication among players ensure that the team can get some useful runs off deflections from the pads. Good field placements and alert wicketkeepers are also a necessity to curb possible leg bye chances.
Besides, leg byes demand teamwork-the moment a leg bye opportunity arises, both batters have to perform almost immediately. From the bowling perspective, bowling tight lines and lengths reduces the chance of giving leg byes.