COSTFREELEVELS4FIRST TRADE10 MINCARDNONEACCOUNTOPTIONALNOT TRACKING
DEPTH
How many people are lined up at each price. A deep book is a long line. A thin book is one guy and a folding chair.
How much size is waiting to trade at each price level.
LEARN THIS PROPERLY
This word comes from the Bidness Academy, a free trading program you can start at zero.