Shoulda been a Euro character there. I bet there wasn't. Now, some seem to work: < for less than, > for greater than.
Perhaps it's my Mozilla settings? No, it shouldn't matter, because I seem to see Euro signs on other websites OK. I don't get it, and it seems kinda unfair to have to type out "Euros" when talking about European economic issues when I can just hit "$" for American (and Canadian, and Australian, and a few other) money.
Is there a kind soul who can explain which amp-entities work, and why the others don't?