@gunchleoc @c64whiz @bloor ...
I have never heard anyone call (what is supposed to be) a huge river a "stream" but ok.
I believe it means "don't cross the streams*" which is a reference to the original Ghost Busters movie. (No clue why it's resurrected these days as a modern Internet meme, but it shows up a lot, lol.)
(* except that one time)
Or maybe it just means audio streams or something. I don't know. ๐คท
Most of us didn't know these were mains cables originally until that other post.