Triple Shot is a power-up for Carmelita Fox in Sly Cooper: Thieves in Time. It allows her to fire three shots from her shock pistol. It can be purchased from ThiefNet for 700 coins and is available after completing "Mechanical Menace."
After purchasing Triple Shot, it can be used by holding to access the Gadget Grid and selecting it from the far right. Press to fire three shots at once.