From Q post about Denver Airport.
>https://thechive.com/2012/03/08/something-is-rotten-in-the-denver-airport-25-photos/
At a glance, AU AG would logically be the symbols for gold and silver. But that meaning is called into question when you find out that one of the founders of the airport also discovered a new, deadly strain of hepatitis known as Australia Antigen, also called AUAG. It has been rumored that AUAG could be a potent weapon in biological warfare. This symbol rests on the ground directly in front of the biological warfare mural.