If you've watched any Ohio State football games, you've probably noticed the players' uniforms, especially their gray, sticker-filled helmets. But what is on those stickers? And what do they mean?

Michigan and Ohio State are two of college football's most recognizable brands ... Much like many elements of the Michigan-Ohio State rivalry, helmet stickers trace back to Woody Hayes (Ohio ...

Per Ohio State. The stickers are awarded to players based on "execution of an exceptional play on the field," and first appeared on players' helmets during the Buckeyes' 1967 college football season.