This symbol is called a treble clef There is a treble clef at the beginning of every line of guitar music.
A staff with a treble clef written on it is called a treble staff.
There are only seven letters used for notes in music. They are:
These notes are known as the musical alphabet.
Guitar music notes are written in the spaces and on the lines of the treble staff.
BAR LINES are drawn across the staff, which divides the music into sections called BARS or MEASURES. A DOUBLE BAR LINE signifies either the end of the music, or the end of an important section of it.