A streamliner is a type of vehicle or design that is meant to reduce air resistance and improve efficiency. It is often associated with sleek, futuristic looks. However, there are several other terms that can refer to a similar concept. For example, a bullet train, high-speed train, or sleek train may all be used to describe a fast and efficient form of transportation. Similarly, terms like aerodynamic, streamlined, or modern may be used to describe products or designs that are built for speed and efficiency. Whatever the term used, the focus is always on creating a design that maximizes performance and minimizes drag.