Cyphers

noun

1. A numeric character.
2. Any text character.
3. A combination or interweaving of letters, as the initials of a name; a device; a monogram.

   "a painter's cipher, an engraver's cipher, etc."

4. A method of transforming a text in order to conceal its meaning.

   "The message was written in a simple cipher. Anyone could figure it out."

5. A cryptographic system using an algorithm that converts letters or sequences of bits into ciphertext.