A "relief valve" is a term used in engineering to describe a safety device that releases pressure within a system to prevent damage or failure. There are several synonyms for this term, including pressure relief valve, safety valve, pressure safety valve, and relief culvert. These synonyms are typically used interchangeably in the industry, depending on the context and type of system being discussed. Regardless of the term used, the purpose of a relief valve remains the same - to provide a safety mechanism that protects a system from over-pressurization and potential damage or failure.