What is one symbol that represents something important about the Aztecs capital city?

One symbol that represents an important aspect of the Aztec capital city of Tenochtitlan is the image of an eagle perched on a cactus with a snake in its beak, as depicted in the Aztec legend of the founding of their city. This symbolizes the fulfillment of a divine prophecy and the location where the Aztecs were destined to build their capital.