Nogo

Nogo, often written no-go, is a term used across several fields to denote something that is not allowed, not feasible, or not meeting requirements. The hyphenated form is common in technical and policy contexts, while non-hyphenated variants occasionally appear in informal usage.

In security and policy contexts, no-go zones designate areas where entry is prohibited or dangerous. The term can be political or controversial, and definitions vary by country and organization. It is frequently employed in discussions of safety, risk, and access control.

In manufacturing and engineering, a go/no-go gauge is a simple tool used to verify whether a part's dimensions fall within specified tolerances. A go gauge should fit the part, while a no-go gauge should not; this rapid check helps ensure quality and consistency in production processes.

In aerospace, automotive, and other high-stakes operations, teams use go/no-go criteria during preflight, countdowns, or testing to determine whether conditions are acceptable to proceed. A go means proceed; a no-go means halt or delay, until issues are resolved. In project management and software development, a no-go decision refers to stopping or re-evaluating a course of action when key milestones or risks are not met. See also go/no-go gauge, restricted area, and launch criteria.