How cumm Greek characters are regected?

I mean it's on my signature but are rejected on the post.
Who would I write Pi equations here? HMM?

Edit it also does not like the word cu-um . Are we getting overprotective now?

Probably related to:

Unicode (UTF-8) is still broken on these forums, as of Feb 23rd
https://www.vbforums.com/showthread....as-of-Feb-23rd

Make sense.
Although my signature is Unicode but I guess it's for insert or update or signatures are unaffected.
OK, thanks.