In poker, the buck or dealer button is a marker used to indicate the player who is dealing or, in casino games with a house dealer, the player who acts last on that deal (who would be the dealer in a home game). The term button is also used for a variety of plastic discs, or lammers, used by casinos to mark status of players.

History

When poker became a popular saloon game in the United States in the middle of the nineteenth century, the integrity of the players was unreliable and the honor codes that had regulated gambling for centuries became inadequate. Because the dealer has the greatest opportunity to cheat (by manipulating the specific cards that players receive, or by inspecting the dealt cards), the players would take turns in this role. To avoid arguments about whose turn it was to deal, the person who was next due to deal would be given a marker. A knife was a common object used as such a marker, and the marker became generally known as a buck as an abbreviated reference to the buck's horn that formed the handle of many knives at that time.

When the dealer had finished dealing the cards he "passes the buck". According to Martin, the earliest use of the phrase in print is in the July 1865 edition of Weekly New Mexican: "They draw at the commissary, and at poker after they have passed the buck.". The phrase then appears frequently in many sources so it probably originated at about this time. US president Harry S. Truman's use of the slogan "the buck stops here" in speeches, and on a sign on his desk, derives from the adoption of the phrase "passing the buck" as a metaphor for avoiding responsibility.

The use of other small disks as such markers led to the alternative term "button". Silver dollars were later used as markers and it has been suggested that this is the origin of "buck" as a slang term for "dollar," though by no means is there universal agreement on this subject.

Dealer button

Today, a white plastic disc with the word "Dealer" is typically used as a dealer button in casinos and home games. Beyond marking the player in the dealer position, some games use the button to signify transitory details about the hand being played