Also known as a "high pull".
Here's a pretty good description:
"The power pull starts with the lifter in the position to complete a deadlift: hands are shoulder-width apart on the bar, the back is straight or slightly arched (natural spinal curve), thighs are parallel to the floor, and feet are flat on the floor. The bar is lifted as close to the body as possible until the bar is at the top of the sternum. In this position the arms are fully flexed at the elbow, the upper arm is parallel to the floor, the back is straight, and the lifter is standing on his/her toes. This movement is completed at maximal velocity..."
http://www.sportsci.org/jour/9901/rmn.html
"This exercise is very similar to the Hang Clean, but the weight is not caught across the shoulders."
http://orgs.jmu.edu/strength/JMU_Sum...power_pull.htm
Of course, the above relates it to a "hang" clean, whereas a real "power" pull starts from the ground.