The<unk>  (vertical wrinkling of the forehead) is a medical sign consisting of vertical forehead wrinkling around the bridge of the nose and the glabella. This can be seen in neurodegenerative diseases such as progressive supranuclear palsy.
Procerus sign
String sign
Puddle sign
Steeple sign
Blumberg sign
Bing's sign
Limbus sign
Dunphy sign