Interactive Marketing Unit – IMU
The standard ad unit sizes as set forth by the Interactive Advertising Bureau (www.iab.net). Popular ad unit sizes are: large rectangle (LREC) 300×250 IMU, square 250×250 IMU, large rectangle 336×280 IMU, small button 125×125 IMU, full banner 468×60 IMU, leader board 728×90 IMU, skyscraper 120×600 IMU.