More specifically, in Vim if I press escape twice (and under some other circumstances too) I get this character appearing:
It can be replicated by typing echo, then Ctrl-V, then escape
Here's what it looks like:
I've tried changing the font and TERM setting, neither of which make a difference. No other terminals I've tried (xterm, urxvt, that KDE console) have the same behaviour.
What I'd like to know is whether this is a bug or intended behaviour, and if there's any workarounds