Cryptogram (noun)

A message written in a secret code or encrypted form that can only be read with the key to the code.

Origin:

The word 'cryptogram' is derived from the greek words 'kryptos' meaning 'hidden' and 'gramma' meaning 'letter'. it refers to a message that is encrypted or written in a secret code.

Examples:

1. The cryptogram was a challenge for code-breakers and puzzle enthusiasts.
2. Cryptograms were commonly used in the past to send secret messages.
3. The cryptogram was solved after several hours of effort.
4. Cryptograms can be found in puzzle books and magazines.
5. The cryptogram used a simple substitution code to scramble the letters.