A type of body jewelry composed of a hollow tube and something to prevent the tube from falling out of the piercing. Also called earlets, grommets, or flesh tunnels. Some eyelets are double-flared, which requires stretching the piercing out a bit to fit in in there but makes the chances of it falling out pretty damn small. Others are single-flared and held in place with small rubber bands that snap into a small indentation in the tube. You need to go about 6 gauge or so before eyelets become really apparent - finding them above 8 gauge or so is pretty hard anyways. They're not that suitable for fresh piercings, but stretching up directly to them is just fine.

I myself have a 6 gauge single-flared eyelet, and it's a pretty neat looking piece of jewelry. It's fun to lift things with it, and just the realization that you have a gaping hole through your ear can be amusing. Watch out though - I've squicked a few people with it, and I can't imagine prospective employers will love it, but it's a pretty unobtrusive way to have something special in your ear as long as you stick to high gauges.