Seventh Column

The Symbol
The symbol is a hollow ring with 7 rectangular spokes. The one on the top goes into the middle and is not connected to the rest of the ring.

What it Means
The Seventh Column represents Bungie's entertaining step to world domination. They are listed as so:
 * 1) Start independent gaming software company. (Complete)
 * 2) Dominate Mac platform: Launch assault on Windows platform. (Complete)
 * 3) Announce killer gaming title. (Complete)
 * 4) Acquire strangely addictive Chinese food company. (In progress)
 * 5) Recover Ling Ling's head. (Complete)
 * 6) Stage bloody coup of new parent company. (Complete)
 * 7) Take over World. Shoot enemies into sun with giant slingshot. (In progress)

You can find these steps in the extra disk that comes in the Halo 3 Legendary edition.