What is the origin of the National Park Service arrowhead symbol?
The arrowhead was authorized as the official National Park Service symbol on July 20, 1951. The Sequoia tree and bison represent vegetation and wildlife, the mountains and water represent scenic and recreational values, and the arrowhead represents historical and archeological values. As with all US government symbols, it is illegal to display this logo outside of official use, but here is a link to the symbol.