I'm not sure what they're actually called, I've just noticed how popular they're becoming. I don't see the point in them. It's almost like people are bragging about how good of a mom they think they are. But I doubt that's the real reason why they've become so trendy. I guess they're proud of the choices they've made. I just don't see why it needs to be broadcasted on your car. They rub me the wrong way.