If a player who can follow suit does not do so, or in games with additional restrictions on card play, not following these restrictions is known as a revoke, or 'renege'. A revoke typically cannot be discovered at the time when it is committed, but when a player plays off-suit to a trick, competent opponents will make a mental note that the player does not hold the suit led, and will notice later if the player later plays a card of the suit they were thought to be void in. The situation is similar for other types of revoke. Most game rules prescribe a severe penalty for a revoke and may also result in the hand being voided (a "misdeal"). Decks of cards have been marketed for trick-taking games with the traditional French suit symbols, but in four colors; these are often called "no-revoke" decks, as the color contrast between each suit makes a potential revoking play easier to spot and harder to do accidentally.