In music notation, a bar-line is a thin vertical line drawn through a staff to indicate the separation between two measures (or bars). It is drawn from the top horizontal line of the staff to the bottom one. When a grand staff is used, the bar-line is continued between the top and bottom staffs.

It looks something like this (complete with staff, treble clef, time signature, and quarter notes):


    /\                                                     
---| /-------------------|--|---------------*---|
   |/                |   |  |           *  |    |
---/-------------|---|---|--|-------*--|---|----|
  /|    4    |   |   |   |  |   *  |   |   |    |
-/-|/\-------|---|---|--*---|--|---|---|---|----|
|  |  | 4    |   |  *       |  |   |   |        |
|--|--|------|--*-----------|--|---|------------|
 \ |  |     *               |  |                |
--\|_/----------------------|-------------------|
   |                                                       
  \|                                                       

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