Per Kyle Meinke, the Athletic Department has sent out a flier detailing which Block M's are and aren't right. A lot of people here knew about the Split M, but here's the official guide.
Not every block M was created equal. What is and isn't approved, per the U twitter.com/kmeinke/status…— Kyle Meinke (@kmeinke) February 28, 2013
What's funny is that Yost and Crisler have "incorrect" Block M's