Basically a three-wheeled version of the box bike. Some people prefer the trike because of their stability but usually there's a trade-off with making it harder to make turns and more difficult to negotiate tighter spaces and avoid potholes. Some bikes like Nihola and Butchers & Bicycles overcome the turning limitations with sophisticated mechanisms in the wheels. Butchers & Bicycles trikes will actually lean into the turn.
Some of the common brands include Nihola, Babboe, Triobike, Butchers and Bicycles.