With IE 11, if I have this CHR(250) in a page, it appears ok. If I move to a page and hit the back button of the browser, IE inserts the  character before CHAR(250). I did not observe that before because I had an emulation that in the Meta Head to work with compatility IE 9. So, it seems this is a bug in IE 11. Anyone can confirm that?

I had to escape the character. As surprisingly as it gets, on that one, the code to use was 183 as 250 would have given the latin small letter u with acute.