codedsign
nounUK /ˈkəʊdɪd saɪn/
US /ˈkoʊdɪd saɪn/
A coded sign is a secret picture or mark that only certain people can understand.
The spy left a coded sign on the door so her friend knew it was safe to come in.
OTHER MEANINGS
2. A sign written in a programming language that a computer can read.
The developer fixed the coded sign that told the app which screen to open.
3. A written message that has been changed into a secret form.
The treasure map had a coded sign pointing to the hidden chest.
4. A special gesture or signal used by a group to mean something only they know.
The team used a coded sign with their hands to plan the next play.