As of last year, now an official policy (see the Georgia Tech Policy Library)
Key Points:
Units may not create their own logos or alter the official institute logos.
Academic units may not use athletic spirit marks (Buzz, interlocked GT, stacked GEORGIA TECH, Ramblin Wreck, etc.)
Units cannot feature slogans prominently unless they are phrased as "Creating the next ..."
- Also, new restrictions on domain names (*.gatech.edu, *.net. *.org, *.com)