I don’t recall this being discussed before, and I’m certainly not suggesting that Penn State adopt helmet stickers. Their stickers tell the story of the player, indicating wins (by all time win number), bowl games, rivalry games, academic success, etc. I think this is pretty cool.

New Michigan helmet stickers to tell story of a player's career
Now, the stickers represent anything from a win (the first win of the season will produce a sticker with 965) — to rivalry games, to All-Big Ten honors and academic honors, and a captain will have a sticker with a "C."
www.detroitnews.com