from a post I saw on RC.n00b

"Snake pro is the piece that you put in before you get to the topout or a ladege. This is put in in case there is a snake sitting on the ledge that you are just about to reach. A lot of people will run it out on the easieir ground near the top of a route. Caution needs to be exercised in case you come across a surprise at the top. Thus the snake pro."

Huh.......wonder if this guy knows Kenny Card and Bob Conz....or has heard the "flying rattlesnake" story.