Nervous movement is a term used to describe the involuntary movements of the body that are caused by anxiety or stress. TIC is a three letter acronym for a type of nervous movement, which stands for 'Tourette's Syndrome Involuntary Movement'. FIDGET is a six letter acronym for another type of nervous movement, which stands for 'Frequent Involuntary Distracting Gestures and Twitches'. Both of these terms refer to the same type of behavior, which is an involuntary movement of the body caused by anxiety or stress.