What Does The Symbol On The Mexican Flag Represent?

The central emblem is the Aztec pictogram for Tenochtitlan (now Mexico City),
the center of their empire. It recalls the legend that inspired the
Aztecs to settle on what was originally a lake-island. The form of the
coat of arms was most recently revised in 1968. Aztec legend held that
they should found their city on the spot where they saw an eagle on a
cactus, eating a snake. Ribbon in the national colors are at the bottom
of the coat of arms.