What is this? It’s like a little cursor nose.
[image lost – sorry]
UPDATE: John Resig of Mozilla and jQuery fame has provided the answer. To Firefox this is a feature when you mix right-to-left or left-to-right text-directions. The little tick tells the user which direction the text should go. I can almost guarantee that no user gets that. 99.99% of users will think its a bug. Bad UX.