....I guess we have been involved with the "net", a little longer than we actually remember.
These shorthand expressions, and there are many, many more, were developed for the old internet, words only, and for guys who didn't type. It sped things along, without having to actually write them, a type of code. Back then, who knows how many years ago, all of us just seemed to understand.
I recently found my first "web page", from a lifetime ago, interesting that all the information was still current.