Tic
A tic is a sudden, repetitive, nonrhythmic motor movement or vocalization involving discrete muscle groups. Tics can be invisible to the observer, such as abdominal tensing or toe crunching. Common motor and phonic tics are, respectively, eye blinking and throat clearing.
List of motorized trikes
List of motorized trikes is a list of motorized tricycles also called trikes, and are sometimes considered cars. Three main configurations are motorized bicycle with side-car, two wheels in rear one in front, and two in front one in the rear (aka reverse trike). However, language and definitions vary.