What Does Big Red Switch (BRS) Mean?
The Big Red Switch (BRS) is a physical or metaphorical switch or button for which activation has ominous implications. A Big Red Switch is always very visible, and may stand as a warning itself as it is often designed to only be used in extreme situations. As such, the term has become a metaphor for extreme situations such that when an emgerency arises, someone might say "pull the Big Red Switch."
Most often the Big Red Switch is a last resort in computer security, most specifically in mainframes or servers that have come under an attack that cannot be stopped and thus must be shut down. The term may also refer to major system resets.
The Big Red Switch may also be called the Big Red Button (BRB).