code word
US /ˈkoʊd wɜːrd/
UK /ˈkoʊd wɜːrd/

1.
parola in codice, parola d'ordine
a word or phrase that has a secret meaning and is used to give a message or signal
:
•
The spies used a specific code word to identify each other.
Le spie usavano una specifica parola in codice per identificarsi a vicenda.
•
Only those who knew the code word were allowed to enter.
Solo a coloro che conoscevano la parola in codice era permesso entrare.