Fret the note as shown, but dig into the string with the side of the thumb as you sound it with the pick.
Pick the note while lightly touching the string directly over the fret indicated. A harmonic results.
A previously sounded note is touched above the fret marked TCH (eg TCH 9) to sound harmonic.
Fret the note as shown, then lightly place the index finger over ‘x’ fret (AH ‘x’) and pick (with a pick, p or a).
Fret the note as shown, but sound it with a quick righthand tap at the fret shown ( TH17) for a harmonic.