Musée Carnavalet

This cool sign is in the museum of the
city of Paris, a wonderful repository of
all things Parisien, including recreated
rooms, building models, and shop signs
from a time when most of the population
couldn't read. Some of them are fairly obvious
(see below), but I have no idea what this is
supposed to signify. Any ideas? 

I'm linking back to That's My World Tuesday.
To see more of the world, go here.]