That acronym of SCRAM also appears to be a myth.
https://public-blog.nrc-gateway.gov/2016/02/18/refresh-putti...
Myth or not it’s in the original Atari manual and hardly worthy of a downvote.
https://public-blog.nrc-gateway.gov/2016/02/18/refresh-putti...
Basically it was how they shut-down nuclear reactors by cutting a rope that would drop the controls rods into the reactor.
Side-note: I know this because I played an Atari 800 game called SCRAM growing up. It was pretty good!
Also reminds me of SNAFU - Situation Normal All Fucked Up.