What is a two wheeled mode of transport made for person, and is not a bicycle etc.? See detail.

Edited to add: It’s not a wheelchair. So, it’s not a bicycle, a moped, a scooter (whatever the difference is, so many questions out there asking that), a motorcycle. What could it be that’s two wheeled but not any of the above? It could be there are more than 1 item, I’m not sure.