I

Ice
A cold deck.

Ideal Edge Odds
The theoretical maximum edge odds, which are impossible to achieve.

Idle Card
A card that adds no value to a hand.

If
See Gambler's Last Charge.

Ignorant End of a Straight
The lowest end of a straight, especially in Hold 'em.

Immortal
(1) The best possible hand. (2) A certain winner.

Implied Odds
Similar to pot odds, except that the money in the pot is not actually there yet.

Improve
To draw cards that improve one's hand.

In
To remain in the pot.

In a Row (Line)
A sequence or a straight.

In Action
The time when a player is involved in playing his hand.

In the Air
A poker tournament starts when the tournament director instructs the dealers to start dealing

In the Hole
Cards dealt face-down in stud poker.

In the Middle
The position of the players calling bets between two raising players (Middle Man).

Index
(1) The number or letter printed on the corners of cards. (2) The marks a cheater puts on the edge of cards.

Indirect Bet
An opponent betting or raising for a player sandbagging a strong hand.

Inside Straight
A broken sequence of four cards, such as three, five, six, seven.

Insurance
A side bet to ensure winning some money in a large pot.

Intentional Flashing
Purposely flashing or showing one's closed cards to an opponent.

Investment Odds
The estimated returns on betting investments.

Iron Duke
An unbeatable hand (Ironclad Hand).

Isolate
To raise with the intention of thinning the field to a single other player.

It
Usually refers to the largest amount anyone has yet bet in a round