I hadn’t even noticed it, first time I see it too. It looks like it’s meant to stand for “care of”: https://en.m.wiktionary.org/wiki/care_of.

Very likely a mobile typo. Keyboards often expose a lot of different utf-8 chars when you hold it down and you're always a few mm away from releasing on something completely different. Muscle memory and hard to see choices easily makes it a double.

I did not realise it until you pointed it out

I'm using openboard on my mobile and it is probably mapping the wrong UTF-8 character for that symbol.