<unk>  is medical sign in which the navel moves towards the head upon flexing the neck, indicating selective weakness of the lower abdominal muscles. Causes include spinal cord injury, amyotrophic lateral sclerosis (ALS), and facioscapulohumeral muscular dystrophy (FSHD).
Beevor's sign
Lockwood's sign
Litten's sign 
Litten's sign
Dance's sign
Adson's sign
Darier's sign
Hegar's sign