It looks like the symbol from Harry Potter that is used for the Deathly Hollows by Warlocks.
IX is Roman numerals for 9
Could this mean Xur and the Nine are a secret society of Warlocks? Does Xur say his actions are not entirely his own because he is under the Imperio Curse which controls his will?
Is it a coincidence that the symbol in both Destiny and HP look like an eye in a pyramid which is used by the illuminati?
The triangle has 3 sides. Xur is 3 letters
3x3 is 9. The nine are what Xur is the agent of. 9/9 is 1. There is 1 all seeing eye in the illuminati.
Also look at the space magic shirt by Bungie! Warlocks are the illuminati!
He-Who-Must-Not-Be-Named is the head of the Nine, the warlocks, and the Illuminati!
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And today on 9/11 Bungie released 'Mayhem'!!!