What is a 3 bet in poker?

What constitutes a 3-bet in poker depends on which version of game you are playing. In Limit Texas Hold’em, a 3-bet is just a simple one unit reraise. In NLH on William Hill NJ a 3-bet is a reraise that is at least doubling the previous bet all the way to the amount of the smallest stack in play. In pot limit games such as Pot Limit Omaha, a 3-bet is a reraise that is maxed out to the size of the pot.