In honor of the release of the Nintendo Wii the Great Dome found itself hacked.
Photo Credit: Eric Schmiedl
More photos can be found here
Update (11/19/06; 2:08 PM)
The cultural reference for that symbol goes back to one of my favorite video games from when I was a kid, Zelda!
The symbol is the Triforce symbol.
The holy Triforce was created by three Goddesses to serve as a symbol of their sacred bond with Hyrule — the world they had created. The Goddess Din offered the Triforce of Power, Nayru contributed the Triforce of Wisdom, and Farore presented the Triforce of Courage. Combined, the three pieces formed the ultimate sacred Triforce.