We know a decent amount about the Destiny universe with the release of the vidoc, but what significance does the logo have with the story? Halo's logo was... a halo. Reach's logo was Noble Team's insignia. What will the Destiny logo represent? A sort of flag representing the last city? A banner of the city's military? Feel free to speculate.
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I think it's the symbol of the Last city for sure. At 1:08 on the Destiny gameplay reveal, you can see it on a banner on what appears to be the main governmental building. So it's safe to assume its to represent the last city.