It is called the termination line, such as: "∣▕".

There are two types:

1. Both are thin lines, indicating the end of the section;

2. The front is a thin line and the back is a thick line. , indicating the end of the music (or movement).

Extended information:

Music always alternates between strong beats and weak beats. This alternation cannot be chaotic or arranged arbitrarily, but forms the smallest rhythm organization according to certain rules. a section, and then repeat from there.

For example, when there is only one weak beat between two strong beats, it is called "two beats", and 2/4 beats are of this type; when there are two weak beats between two strong beats, It is called "triple beat", like ¾ and 3/8; there are three weak beats between the two strong beats, which is called "four beat", the common one is 4/4.

Two sections are separated by a "section line". There are five lines on top of the bar line and one line on the bottom, which just cuts off the staff. No matter how far away the upper and lower lines are from the staff, the bar line cannot go beyond the staff.