Tap harmonic
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Tap Harmonics is a technique used with fretted string instruments (usually guitar). It is executed by tapping on the fret bar itself an octave higher than the fretted note on the same string. This can only be done on frets 1-9 (and fret "0") on a normal 21 fret guitar, but can be done on 1-12 on a 24 fret guitar, including the open note in 2 different places. It can also be done by slightly putting the finger over the fret if the string is already ringing. It can be made easier and more clear with gain (distortion), but can also make a "muddy" sound if incorrectly executed. Eddie Van Halen makes extensive use of tap harmonics in the song Dance the Night Away.
[edit] Example
E string, 3rd fret (G note), 15th fret
[edit] Uses
Its use, like most harmonics in music, is limited, but much more popular in rock.