<unk>  is a clinical sign in which there is a lack of wrinkling of the forehead when a patient looks up with the head bent forwards. It occurs in patients with exophthalmos in Graves disease. The sign is named after Alexis<unk> .
Joffroy's sign
Dance's sign
Hegar's sign
Lockwood's sign
Litten's sign 
Litten's sign
Winterbottom's sign
Adson's sign