In music notation, a quarter rest is a pause in the music lasting for one beat, the same duration as a quarter note. It resembles a stylized bracket drawn in the middle of the staff.
On the staff, a quarter rest looks something like this:
/\
---| /-----------------------------------------------------
|/
---/-------------------------------------------------------
/| /
-/-|/\-----------------}-----------------------------------
| | | \
|--|--|----------------------------------------------------
\ | |
--\|_/-----------------------------------------------------
|
\|