Usage of "│" (vertical bar) in Chinese? The Chinese wikipedia page for vertical bars only talks about:


Math
Physics
Computing


In the book《成都方言》I'm seeing this type of xiehouyu with a vertical bar in the middle of the "注":


  





  缸钵头的泥鳅儿——耍团转│滑不了


My best guess is that it meant either/or but then under the entry for 钵 it's written the same way:


  





  钵 bo 钵钵，钵儿，陶盆：鸡吃一撮，狗吃一～。歇后语：“缸～头的泥鳅儿——耍团转│滑不了。”


No indications of different usage that I can see here.

What does the vertical bar do here? What does it mean? Is it either/or?
You are right, it means either or.

缸～头的泥鳅儿——耍团转

缸～头的泥鳅儿——滑不了

equal to

缸～头的泥鳅儿——耍团转│滑不了