A Quick Look at P4 Helmet Logos

This is a very unscientific classification of the primary helmet of the current Power 4 conference schools. What's the primary helmet today? Whatever I thought of first. The categories are Block Letters (Missouri, Tennessee, for example), Stylized Letters (VT, WVU, UNC), Mascot (Arkansas, Texas), Word (Ole Miss), Plain (BC, Penn State) and Sans Serif Letter. There's plenty of gray area there...except with the last one.