Um. Now I'm thinking that you might have got referred to that link as a consequence of enquiring about the union, in the off chance it may know something about the symbol, rather than a direct response to an enquiry about the symbol itself, in which case the mystery isn't solved at all and I might have to quit work, book a flight, and climb six flights of stairs to the reference material to see for myself.
You are welcome to sleep on my couch during your crusade
