File this under the "it's a very bad idea, but sometimes absolutely necessary" category: I was working on a site that wanted to use a particular font for headlines throughout the site, but the client detested one particular character (an ampersand), and requested any time that character were to occur in the page title, it would be swapped out for a different font.

If at all possible, you should avoid doing what I'm about to describe—but in the off chance you need to have an automated way to scan a string of text and change the font family for one particular character, this is what to do:

First, you need to create a special CSS class that you can apply to the individual character, so in your theme's CSS, add something like: