Tomorrow?
ha I'm fluent in morse code but don't remember those discussions….
hmmm if you took those marks and put them together it could make the "prosign" BT (written as BT with a line above).
_. . . _
Which means "Break". It's a pause or separator, kind of like a period or separation between paragraphs.
See
https://www.skccgroup.com/member_services/beginners_corner/