Inspirations: This symbol we use startled us as it glared in a New York City street. An easy, common icon, the meaning varies. Here it's a surveyor's mark at a construction site near the Museum of Natural History. Put a box around the mark, and this "modern ideogram signifies a nature preserve protected by law. It can be found on road signs...In the same system there is another sign...indicating a sight worth seeing, either from a cultural or a scenic point of view." Dictionary of Symbols, by Carl G. Liungman, © 1998.
the FROG? see blog