A unicycle which is used for hopping, jumping, or riding over various obstacles. Usually has a smaller wheel then a normal unicycle, and stronger components to take extra punishement. In use, the rider hops the trials unicycle over rocks, barriers, curbs, ramps, or wooden pallets. Might also be referred to as a Tuni, but the name has never become popular.

Commonly used in text messages or social media as a short form for Very Sound Advice.