decipheringrule

noun
UK /dɪˈsaɪfərɪŋ ruːl/
US /dɪˈsaɪfərɪŋ ruːl/

A deciphering rule is a special guide that helps you figure out what secret writing means.

The detective used a deciphering rule to read the hidden message in the old book.


OTHER MEANINGS

2. A set of steps used to change scrambled letters back into normal words.

Following the deciphering rule, she turned 'KHOOR' into 'HELLO'.

3. A pattern that helps you understand a confusing sign or symbol.

The museum map had a deciphering rule at the bottom to explain its symbols.

4. A method for solving a word puzzle by matching symbols to letters.

Each crossword came with a deciphering rule printed in the corner.