Stagepin is a Type of Power plug used for high powered
lighting instruments most often used on
stages and the like. Like the standard
edison connector (which your computer is most likely plugged in to), it has three prongs: Hot, Neutral and Ground. Unlike the Edison, however, the three prongs are arranged in a straight line. one may also add that the ground connector on stagepin is noticably longer, helpful for those high wattages...
What the different connectors look like from the front:
Edison
_____ ___________________________
/ \ | |
/ O \ | O O O |
| | |___________________________|
\ | | /
\_____/
With the plugs being:
Ground
Hot Ground Neutral
Hot Neutral
The main difference between Stagepin and edison (besides the shape and size) is the wattage. Most Edison Sockets run anywhere from 10 watts (fluorecsent lights) to 150+ watts. Most stagepin Sockts run at least 15 Amps (around 2000 watts). This is helpful for "throwing" light from a few hundred feet away and still having definite edges.