Which term describes a new product, system, or process created by study and experimentation that has never existed before?

The term that best describes a new product, system, or process created through study and experimentation that has never existed before is "invention." Inventions are original ideas that emerge from creative thinking and research, leading to the development of something entirely novel. This process typically involves identifying a problem or need, exploring potential solutions, and ultimately producing a unique concept or item that contributes to the world in a new way.

Other terms like "design brief," "innovation," and "prototype" do play significant roles in the development process but do not specifically capture the essence of a completely new creation. A design brief outlines the problem and vision for a project. Innovation generally refers to the improvement or enhancement of existing products or processes rather than the introduction of something entirely unprecedented. A prototype is a preliminary model of a product that serves as a tangible representation of an idea but is not itself a new invention.