[1] A full toss which reaches the batsman above the waist is called a beamer.
This is not a valid delivery and will lead to a no-ball penalty, but, like the bouncer, is sometimes used as an intimidation tactic.
A low full toss is frequently the result of an error made while attempting to bowl a yorker, which bounces at the batsman's feet.
Occasionally a full toss can surprise a batsman so effectively that he is unable to play it properly, and this can lead to a wicket, but few bowlers rely on this.
There have been occasions in which a bowler intentionally bowls a full toss to achieve maximum swing into the base of the stumps.