The pentagram is the graphic system used by musicians to represent in writing the music. It is in the pentagrana where musical notes are written.
Thus, we also have musical notes are graphical representations of musical sounds.
We at playing the piano, use a system known as double staff, which serves to represent the bass and treble sounds simultaneously.
Consider first a simple staff:

Figure 4. Staff with their spaces and lines from bottom to top.
The only interesting thing to know is that the lines and spaces of the staff are appointed from the bottom up as shown in the chart.
The double staff
What use to learn the notes of the piano will be twice the staff, which is the ideal graphics system for pianists. These are two parallel staves, one for the right hand and the other to the left.

Figure 5. The double staff of the piano.
The clef is a symbol used to connect a line space or staff with a musical sound. Thus we have the treble clef 2nd line indicating that on the 2nd line Sun Similarly place the note applies to the bass clef on 4th line.