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@elb
Proximally, I was thinking recently it was because #/ was the character dispatch macro in zetalisp in the early 80s. Now it's #\, but I had to add #/ as the "zetalisp character dispatch macro" to run some zetalisp code recently. So there's a reason to choose something else. Also ~/foo:bar/ is a format control in lisp (call the exported bar from foo on the output stream).
To my knowledge, it's encouraged to use the unused bracket characters for this kind of stuff.
@tfb @pymander