Expression parser doesn't allow the Ω character

[josdejong]

I see the parser doesn't allow the Ω character (ohm, \u2126). That would be a nice one to add. I haven't yet checked whether this is part of a block of related characters that we still miss, could well be.

[FSMaxB]

It's part of the greek symbols, I think all of them could be useful be cause they are used as symbols quite a lot in mathematics.

No it's not, sorry. The search engine gave me the wrong character as response to my query.

[josdejong]

It's part of a block with "letter like symbols". We can just add this block (range \u2100 to \u214F).

http://unicode-table.com/en/#letterlike-symbols