Mobius Ampersand by typographer Dave Bailey. It’s an ampersand, and it’s mathematically non-orientable. What’s not to love?

Unsurprisingly, I’ve geeked out Möbius-style before.

Update: I just learned that Bailey’s ampersand is one of many collected for Font Aid IV, a collaborative typeface to consist entirely of ampersands (note that the project’s theme is “Coming Together”). The completed font will be sold with all proceeds going to the Doctors Without Borders effort in Haiti. You can see more of the ampersand submissions in this Typophile thread.