US National Park Service arrowhead symbol as proposed in 1951 by Herbert Maier and adopted in 1952, found at [1]

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The arrowhead symbol is the registered trademark and service mark of the National Park Service and may not be used without prior written permission from the Director of the National Park Service (Reg. No 3,175,869; Nov. 28, 2006). All use must be in accordance with Part 11 of title 36 of the Code of Federal Regulations. Any unauthorized use is a violation of 18 U.S.C. §701, punishable by a fine or imprisonment or both. You are solely responsible for ensuring that you do not infringe the rights to this trademark.