alphabetcode
nounUK /ˈæl.fə.bet kəʊd/
US /ˈæl.fə.bɛt koʊd/
An alphabet code is a secret way to write where each letter stands for something else.
The kids made an alphabet code so only they could read their notes.
OTHER MEANINGS
2. A system that uses letters to stand for words or numbers.
The pilot used an alphabet code to spell out the airport name.
3. A fun puzzle where you swap letters to hide a message.
We solved the alphabet code and found the treasure map.
4. A set of letters used in a special order for sending messages.
The spy wrote the note in an alphabet code that looked like gibberish.