Cipher wheel

A cipher wheel, also known as a cipher disk, is a simple tool used to encode and decode messages. It consists of two concentric rotating disks with letters or symbols around their edges. By aligning the disks in specific ways, you can substitute each letter in your message with another letter, creating a coded message. To decode, you align the disks the same way and read off the hidden message. This method is historically used for encryption, making messages secret by changing their letters systematically, yet it remains easy to use with basic understanding.