Music is made from patterns of times of sound joined with patterns of times of silence.
Time of sound are shown using symbols called notes.
Time of silence are shown by symbols called rests.
Rests are used in bars of music for times of silence in the same way as notes are used for times of sound.
The rest symbols are equal in time to the time taken by note symbols.
Music is written on a frame of lines called a stave.
You will learn much more about staves in PART 3 of NOT JUST NOISE PLAINSPEAK SESSIONS.
These rests are shown on the lines of a stave.