Proud to add this to my collection of photos of manhole covers. It's quite rare now that I see a new type of cover, but this is the first one I've seen marked excrement. The character is 糞, the full form of 粪 (fèn), although the proportions make it look as much like 米田共, a euphemism based on the componenents of the full form character. I assume it leads to a septic tank rather than a pipe carrying turds around the city.
Manhole-enthusiasts can find this gem at the corner of Wangfujing and Meishuguan Dongjie.