The G CLEF is a sign placed at the beginning of the music staff to indicate the pitches of the notes. Without a clef sign, notes on a staff have no meaning. It is the key that leads to being able to read the music.
The F clef is also called the treble clef, and some even call it the "right" clef because it usually indicates what the right hand is doing in piano music (but not always...).
When drawing this clef, one starts with the bottom curve curling around the second line of the staff, which indicates the G above middle C.
These are paper patterns for applique, embroidery, or other art projects. Each pattern purchased contains three regular, instructional pages (8.5 x 11 inches) plus one over-sized pattern page (16 x 16 inches) for the making of one block that will finish 15 x 15 inches square.