Poker terminology - Terms with an "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