The phrase 'power down procedure' is a commonly used term to describe the process of shutting down a device or a computer system. There are various synonyms for this term that can be used to describe the same process in different situations. Some of these synonyms include 'shutdown process', 'power off sequence', 'system shutdown procedure', and 'power management protocol'. These terms are all used to describe the important steps that are required to be taken when turning off a system in a safe and efficient manner. Using these synonyms can help to avoid confusion and ensure that everyone understands the process involved in shutting down a device or system.