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
Whike are sail-powered trikes, which may or may not be motorized depending if one considers a sail to be a type of motorization.