In Monopoly, what is the name of the card that lets a player leave Jail without paying?

The Monopoly card that lets a player leave Jail without paying is the Get Out of Jail Free card.

One Get Out of Jail Free card is traditionally found in the Chance deck and another in the Community Chest deck. A player who holds one may use it to leave Jail instead of paying the usual fee or attempting to roll doubles. After use, the card is returned to the appropriate deck.

The card can also be traded to another player for a mutually agreed price. If it is not used, it has value because it provides a guaranteed way out of Jail. A player who rolls doubles to leave Jail still takes the normal extra-turn consequences associated with doubles.

The card does not cancel movement rules after leaving Jail. The player moves according to the valid exit method and then follows the rules for the space reached.