How harmonics look in tablature and standard notation

Notation for guitar is far from being standardized. Here are some of the ways that you will see natural harmonics written in both tablature and standard notation.

	The diamond around a fret number indicates a harmonic in tablature.
	Harm stands for, your guessed it, harmonic.
	N.H. stands for natural harmonic.
-------- -------- -------- -------- -------- --<12>--	In tablature found on the web, the number is surrounded by <> which is the closest thing to a diamond in plain text.
	In standard notation the note heads are written as diamonds. The line or space that the note is written on is not the pitch being played. Instead, this is the note that would sound if your where to play the note normally at that fret. Some indication would have to be made as to which string this would be on.

Page 1, introduction to natural harmonics on the guitar

Page 3, more on playing natural harmonics on the guitar