Page "Betting in poker" Paragraph 55
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Wikipedia
Finally, a player may also borrow money by betting with an IOU, called a " marker ", payable to the winner of the pot.
To bet with a marker, all players still active in the pot must agree to accept the marker.
Some clubs and house rules forbid IOUs altogether.
If the marker is not acceptable, the bettor may bet with cash out-of-pocket or go all-in.
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