I think it's meant to show how one becomes two. One person shares... something, and then that something has doubled. I'm just used to it by now. Never really had to give it thought.
As an Android user why does an arrow out of a square signify sharing something? (Also why is the apple share menu used for so much besides sharing things)
Three dots being connected makes sense though it isn't intuitive.
The first time I saw the square with an arrow I thought it was to spit the screen vertically or to connect to a projector.
Nah, don't think so. The verkehrsberuhigte Bereich is blue and a lot bigger, and this here is always below the parking P since it's just an addendum. But it's really not intuitive to understand