loop
A construct that performs something repeatedly, like a roller coaster.loop control statement
Any statement within the body of a loop that can make a loop prematurely stop looping or skip an “iteration”. Generally you shouldn’t try this on roller coasters.loop label
A kind of key or name attached to a loop (or roller coaster) so that loop control statements can talk about which loop they want to control.
12Sep08
From the Perldoc