secret letters
Covert written messages
Secret letters are written communications meant to be hidden from others—love notes passed covertly, correspondence between spies, or messages smuggled out of prison.
The phrase can also refer to coded symbols or ciphers known only to initiates: The children invented secret letters only they could read.
In some word games and puzzles, secret letters are hidden characters players must discover.
- cipherHidden writing system
- codeSymbolic communication system
- coded messageText needing decryption
- crypticObscure in meaning
- hiddenKept out of sight
hidden meaning · correspondence · envelope · wax stamp · under seal · sealed · whispered · encoded · mysterious · clandestine · cloak and dagger · message · spy · invisible ink · confidential · eyes only · covert · private
secret letterspublic announcements
Communiqués for general audiences
open letters · press releases · public notices · circulars · published letters
secret lettersnewsletters
Periodic subscriber communications
chain letters · form letters · letters to the editor · encyclicals
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