In 2008-9 I had a Neo Freerunner, an early (Linux) smartphone. I also used | in my passwords. Some of the soft keyboards included only a ¦, in the | spot—indicating that the programmer/UI-designer believed them interchangeable. (That is, the character I got on a keyboard by pressing shift-backslash was | even though it was rendered as ¦ on the keyboard silkscreen, but on the smartphone it was ¦ on the key and in the typed text.) This made my log-ins fail in many contexts, and took some inspired thinking to figure out the problem. That was how I first learned the two are not just different glyphs for the same character.