How does an umpire signal that a batter has been dismissed in a cricket match ?

Context: The match details, including runs and dismissals, are recorded by two official scorers, one representing each team. The scorers are directed by the hand signals of an umpire. For example, the umpire raises a forefinger to signal that the batter is out; he raises both arms above his head if the batter has hit the ball for six runs. The scorers are required by the Laws to record all runs scored, wickets taken and overs bowled; in practice, they also note significant amounts of additional data relating to the game

Answer: An umpire signals that a batter has been dismissed by raising a forefinger.