There is a Unicode Technical Standard for this, called the Unicode Collation Algorithm. Whether everyone uses it, I can’t say. As it says on the linked page:
Conformance to the Unicode Standard does not imply conformance to any UTS.
So in other words it’s possible to conform to the Unicode Standard without adhering to the Unicode Collation Algorithm.
whatever this is: ¦
That is the pipe symbol, or vertical bar. When it has a gap in the middle it may be known as the broken pipe symbol or broken bar. It’s considered the same symbol with or without the gap. Early terminals displayed it with a gap to make it distinguishable from lower-case L characters.