Please appologise but I don't know where you are living.. Here in Germany every kid after the 6th grade knows the average sign and is normally using it.
For some reason they didn't teach this symbol to me through my 11.5yrs of formal education in Australia.
I even did the 2unit maths (being the 2nd level) in 10 and 11.
Funny.
I thought Unicode handled this for us as well.
Create a font and have it override something that is good enough if the person doesn't have that font?
This would work fine on the internet, only run into issues when working offline and not able to include the required font.
Hmm I see a flaw in my idea, once the world caught up with coino then we'd have a conflict and have two characters occupying the same spot in the map, boo.
Got any other existing characters we are able to cannibalise for our purposes???
Else we might have to simply live with the square character showing up until everyone catches up and it is a non issue going forward.
(wanted to paste the square char however everything I Googled showed how to solve the problem)