The A1Z26 cipher, also known as the letter-number cipher or the alphabet cipher, is a simple substitution cipher where each letter of the alphabet is replaced with its corresponding position number.
In the A1Z26 cipher:
The letter "A" is represented by the number "1".
The letter "B" is represented by the number "2".
The letter "C" is represented by the number "3".
And so on, until the letter "Z" is represented by the number "26".