It's that tiny little pocket found on most denim jeans, barely wide enough to fit anything in - maybe chewing gum or a couple of coins, but good luck retrieving them without getting your finger stuck.
Despite its seeming uselessness, it's become a staple as far as jean pockets go.
While most of us just accept this weird mini pocket, an online Quora forum thread has erupted after a user posed the question:
"Why do our jeans have a tiny pocket just above the front pocket? Was it something useful that was added or it is just a fashion thing?"
According to Nitin Achdev, who describes himself as a "Thinker. Learner. Dreamer", it's a watch pocket: