<unk>  or glabellar tap<unk>  is a clinical physical examination finding in which a patient is unable to resist blinking when tapped repetitively on the glabella, the area above the nose and between the eyebrows. It is often referred to as the glabellar reflex. It is often an early symptom of Parkinson's disease, but can also be seen in early dementia as well as other progressive neurologic illness. It is named for Abraham<unk> , an American neurologist.
Myerson's sign
Pemberton's sign
Carnett's sign
Adson's sign
Fothergill's sign
Hoover's sign 
Bing's sign
Piskacek's sign