A<unk>  is a sudden, repetitive, nonrhythmic motor movement or vocalization involving discrete muscle groups.<unk> s can be invisible to the observer, such as abdominal tensing or toe crunching. Common motor and phonic<unk> s are, respectively, eye blinking and throat clearing.<unk> s must be distinguished from movements of disorders such as chorea, dystonia and myoclonus; the compulsions of obsessive–compulsive disorder (OCD) and seizure activity; and movements exhibited in stereotypic movement disorder or among autistic people (also known as stimming).
Tic
Lime 
BHIE
Anol
Lisp
Riken
Mers
Kava