Codex Magliabechiano, showing four day-symbols of the tonalpohualli: (Se = one) Flint/Knife [tecpatl], (Ome = two) Rain [quiahuitl], (Yei = three) Flower [xochitl], and (Nahui = four) Caiman/Crocodile (cipactli), with Spanish descriptions. Note how closely the Rain day-symbol resembles Tlaloc, the Aztec god of rain and fertility.