Secret languages

3. A language invented by twins or close friends to communicate privately, often involving made-up words or altered speech patterns. ___ Speak
4. A type of puzzle where letters or symbols are substituted for other letters according to a key.
6. A secret language used by jazz musicians in the 50s". ___ singing
11. A form of communication using hand signals, often used by scouts and military personnel.
14. A type of coded writing where letters of the alphabet are replaced with other letters or symbols.
15. A system of secret communication used by spies and intelligence agencies. ___ Code

1. A system of secret communication used by Native American tribes, involving the use of knots tied in cords.
2. A method of hiding messages within innocent-looking text by using specific patterns or characteristics.
5. First letter of each word is moved to the end in this secret language"
7. A form of coded communication used by prisoners, involving tapping on pipes or walls . ___ Code
8. A method of encoding messages by shifting the letters of the alphabet a certain number of positions. ___ Cipher
9. Where letters are replaced with numbers based on their position in the alphabet. ___ Cipher
10. A secret language used by radio operators in the 50s". __ code
12. A coded way of speaking used by teenagers to communicate secretly. ___ Latin
13. Secret language used by teenagers in the 50s". __ talk