Wilson isn't flashing a gang sign, he's making a cross with his arms and looking up toward heaven, ie at his dad, who died when Wilson was in high school. His dad was in the Air Force, which is why Wilson funded a couple of Air Force Academy scholarships starting this year.
http://www.nbcbayarea.com/blogs/the-...122865134.html
For what it's worth, he also gave out a 1000 gloves this past weekend to needy kids (his idea) and conducted a Q and A period with the kids afterwards. Sorry you don't approve of his facial hair.