The sticker says "LGBTQ Safe Zone" and apparently if a student is passing your office door and suddenly is overwhelmed, he can duck into your office and feel at ease discussing his sexuality.
I'll have to think of my own sticker...
YouTube: Rush Limbaugh TV- Rush's Ribbons Prove He Cares comes to mind.
Can't find the one where he adds a "deficit (debt?) reduction" ribbon made out of a folded dollar bill.