Today I successfully employed one of the new characters in Unicode 6.0, U+1F4A9, also known as PILE OF POO (dog dirt). (See the table and list of names here.)
Needing a separate, sealing garbage can for Roxie’s collected poop I grabbed a spare one from the basement, but I figured it needed some manner of appropriate labeling. This did it. I printed it on a full-page label, sealed it with packing tape, cut it out, and stuck it in place. Hopefully the can will also help keep the garage from smelling like fresh poop on warm days.
Check out this page for more information on this character and to see if your browser and installed fonts support it. Hopefully it does.