Safety-deposit box or vault or safe deposit

I started working for a new company in France where I heard the term (translation from french is something like this either “safety-deposit box or vault” or “strongbox”, or “safe deposit” or “safe-deposit box” wuhich means a highly secured Rep OSS manager where it is the last step where components are hosted before deployment, during dailt CI/CD another serveur is used, for example for sending components in INT environment or preprod
Is this a term/best practice that you introduce in optimale and secure architecture? Thanks