The flag of Wyoming was officially adopted to represent the U.S. state of Wyoming on January 31, 1917. The flag consists of the silhouette of an American bison. The red symbolizes the Native Americans and the blood of pioneers who gave their lives. The white is a symbol of purity and uprightness. The blue is the color of the skies and distant mountains. It is also a symbol of fidelity, justice and virility. The bison represents the local fauna, while the seal on it suggests the custom of branding livestock.

Text modified from "Flag of Wyoming" on Wikipedia which is licensed under CC BY-SA 4.0.