To decipher.

To designate by characters.

A private alphabet, system of characters, or other mode of
writing, contrived for the safe transmission of secrets; also, a
writing in such characters.

To write in occult characters.

Of the nature of a cipher; of no weight or influence.

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.

One who, or that which, has no weight or influence.

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

A character in general, as a figure or letter.

To use figures in a mathematical process; to do sums in
arithmetic.