I'm looking for a well known article site on site design which made an article about embedding just a single character (in this case, '&') from a font to save load times. I believe the site used fixed width, pale colours. Thanks
There was a 24Ways post titled Spruce it Up in 2009 in which the example was ultimately the encoding of a single ampersand.
For cross-reference, there was a previous SO question about this with some other links and considerations.
@Yi Jian's link doesn't involve encoding at all, just referencing a different font, though is also handy.