How to replace comma separator with middle dot?

[Falcon Capt]

I am currently using a ~ to separate the usernames in my "Who's Online" box (I didn't like the comma that was there by default). I tried using a "middle dot" ? but it doesn't work, I end up getting a little diamond symbol with a ? in the middle of it. The middle dot worked in vB3.8.5 but in vB4.0.5 is no longer will display.

Here is what I am currently using, if I change the ~ to a ? I get the diamond with the ? displayed instead of the ?

 

.hyphenlist li:after {
 content:" ~ ";

How do I get vBulletin to recognize the ? (alt+0183) so that I can use that as a separator???