Symbols search engine

Symbols.net is a great search engine, since it's trying to provide access to symbols. Which is not the easiest thing in the world, but I think that they have taken a pretty good stab at it. The search interface is the usual search box, an alphabetical list and a category approach. I dipped into 'C' and got 96 results, and they do show the variety of information available: musical symbols, semaphore characters, road symbols, astrological symbols, electrical, Japanese map symbols, celtic symbols and so on. I tried a search for 'red ribbon' and came back with the expected 'AIDS awareness' but I didn't know that it was also used by the Software Freedom Campaign, for substance-abuse awareness and vasculitis awareness. Did you also know that a purple and red ribbon is used for Chronic migraine awareness? As with other search engines in the Stands4 network this is a niche and specialised engine, which does a very nice job. This would be a really good resource for reference librarians to bookmark, and for the rest of us to remember if we see a ribbon, flag or symbol that we are curious about.