To my enormous surprise, forty-plus years later triple period now means something like recursive wildcard subdirectory in the Go language

# lists your standard library packages and workspace packages

go list ...

# Builds just your workspace as opposed to "go build ..." which is much more exciting, don't do that

go build ./...

I am rather jealous of the M68K as on a 6809 in the 80s running OS-9 Level 1 we were somehow ALWAYS out of both floppy disk space and memory.