English version

code name

From Longman Dictionary of Contemporary Englishcode nameˈcode name noun [countable]  SECRETa name that is used to keep someone’s or something’s real name a secretcode-name verb [transitive] a crime busting operation code-named Jeeves
Examples from the Corpus
code nameThe new system was as deep and mysterious as its chromatic code name implied.He decided to give the various systems code names based on the colors of the spectrum.Medusa was the code name of a back-up disk suite product brought to market a year ago.It was preceded by a scrupulous recce weeks before in a restaurant near his house with the code name Pomme d'Amour.The Triumph code name, by the way, has been changed.Fascination with code names went well beyond operations, reaching even the contra supporters and fund-raisers.
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