Well I meant any character I could type (and find again easily for the second one) that would be unique within the comment and not give me italics, but sure.

I often use ^, since it's kind of like 'imagine there's a superscript here', think I just inadvertently held on it and ↑ popped up and up and I went with it.

> I meant any character I could type

Here’s how to type “†”:

<https://en.wikipedia.org/w/index.php?title=Dagger_(mark)&old...>

> imagine there's a superscript here

A superscript what? It’s an adjective, not a noun.