What is a hammer-on symbol on guitar?
A hammer-on is a playing technique performed on a stringed instrument (especially on a fretted string instrument, such as a guitar) by sharply bringing a fretting-hand finger down on to the fingerboard behind a fret, causing a note to sound. This technique is the opposite of the pull-off.
What is a hammer-on and pull-off on guitar?
A pull-off is basically a hammer-on in reverse. Once you've done a hammer-on with your other finger on the other fret, now just pull that finger off the fret, pulling on the string a little with that finger as you do so and letting the note ring. There—you've pulled off a pull-off.