I
Ignorant End
The low end straight, e.g. holding 7,8 with 9,T,J on board

Implied Odds
Pot odds that do not exist at the moment, but are calculated including any bets that are you expect will go into the pot from your opponents

In the Dark
Describes the act of choosing how to play without seeing your cards first

Inside Straight
Four cards needing one in the middle to complete a straight

Isolate
Typically a re-raise to scare off other opponents so that you can play heads up with the player who originally raised