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Natural - In Blackjack, a two-card hand totaling 21.
Negative Expectation - Theoretical term for an expected gambling loss over a long period of time. See House Edge.
Net Winnings - Total winnings, minus your original wager. Opposite of Gross Winnings.
Nickel - A $5 chip.
Non-Negotional Chip - A promotional chip which cannot be exchanged for cash.
Non-Value Chip - A chip whose value is determined by the amount of the Buy In, as opposed to a fixed value chip.
Number Pool - The entire range of numbers on offer in a game like Keno.
Nut - The amount of money a gambler decides to win before quitting.