cipher

cipher is a Noun

Definition:

[1] A character [0] which, standing by itself, expresses nothing, but when placed at the right hand of a whole number, increases its value tenfold.

[2] One who, or that which, has no weight or influence. Here he was a mere cipher. W. Irving.

[3] A character in general, as a figure or letter. [Obs.] This wisdom began to be written in ciphers and characters and letters bearing the forms of creatures. Sir W. Raleigh.

[4] A combination or interweaving of letters, as the initials of a name; a device; a monogram; as, a painter`s cipher, an engraver`s cipher, etc. The cut represents the initials N. W.

[5] A private alphabet, system of characters, or other mode of writing, contrived for the safe transmission of secrets; also, a writing in such characters. His father . . . engaged him when he was very young to write all his letters to England in cipher. Bp. Burnet. Cipher key, a key to assist in reading writings in cipher.