Unit Toll is a term used to describe the cost of using a unit of a particular service or product. It is typically used in the context of transportation, where it is the cost of using a certain type of vehicle or route. Unit Toll can also be used to refer to the cost of using a certain type of communication service, such as a telephone line or internet connection. The term is derived from the Latin word 'tollus, ' which means 'PRICE.' The crossword solution for Unit Toll is 'AXLE, ' which refers to the central shaft that connects the wheels of a vehicle.