What other interesting examples of codes from history or the modern-day (digital or non-digital) can you find to inspire or support a lesson about encoding and decoding messages?

Some examples of historic or modern day codes could include but are not limited to:

• Binary code
• Pigeon Cipher
• Morse code
• Braille 
• Barcodes 

These could easily be adapted into engaging and informative lessons with a focus on encoding and decoding messages.