What is the term for a design solution that is not intended for user testing?

The term that refers to a design solution not intended for user testing is a sketch. A sketch generally represents a quick and informal visual representation of ideas and concepts. These sketches serve as a tool for brainstorming and exploration during the early stages of the design process. Their primary purpose is to communicate concepts rapidly rather than to serve as a fully formed design to be tested with users.

Unlike prototypes and mockups, which are more developed and aligned with user testing goals, sketches are often fluid and can be easily modified based on feedback or inspiration. This allows designers the freedom to iterate quickly without committing to a specific direction that would typically be associated with more polished deliverables. Blueprints, while they provide detailed representations, are more closely related to a final design or plan that may undergo further refinement and approval before implementation, thus they do not align with the notion of being informal or preliminary as sketches do.