On July 20, 1951, the arrowhead became the official emblem of the National Park Service. Each image on the arrowhead represents a valuable resource that the National Parks strive to protect. The mountain, Mount Rainier in fact, represents the amazing scenery in our national parks as well as the natural resources they provide. The Sequoia tree represents the plants, while the American Bison stands for wildlife. The arrowhead shape reminds us of the historical and cultural values of our parks. See