I don’t remember taking this picture, and the GPS coordinates don’t help at all (appear to be a residential area in Madrona). I added this picture on Feb. 11, 2024 – for some reason the sticker was in my mind.
Regular hexagon (Wikipedia)A regular hexagon has Schläfli symbol {6} and can also be constructed as a truncated equilateral triangle, t{3}, which alternates two types of edges.
Enter Da World of Fantasyania