Umpires have a set of different signals that they make so that the scorers, spectators and fielding side know what's happening. There are signals for No Ball; Wide ball; Dead ball; Byes; Leg byes; Penalty runs (this has two slightly different signals); Boundary 4s or Boundary 6s; New ball; Short run; Revoking a decision; Last hour; Free hit; Powerplay; or when requesting a TV replay. Some of these signals are accompanied by calls.