Cipher

A numeric character.

Any text character.

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."

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."

To calculate.

"I never learned much more than how to read and cipher."

To write in code or cipher.

Of an organ pipe: to sound independent of the organ.

To decipher.