What's the noun for coder? Here's the word you're looking for.
code
A short symbol, often with little relation to the item it represents.
A body of law, sanctioned by legislation, in which the rules of law to be specifically applied by the courts are set forth in systematic form; a compilation of laws by public authority; a digest.
Any system of principles, rules or regulations relating to one subject.
A set of rules for converting information into another form or representation.
“Cryptography is the enciphering and deciphering of messages in secret code or cipher.”
“It would be perfectly possible for a criminal code to provide separate crimes of negligence, with lower maximum sentences, at appropriate points in the hierarchy of offences.”
“Prison gangs have a hierarchical organizational structure and a set and often strict code of conduct for members.”
“The codesheet information is keyboard entered into a computer, with each cell corresponding to a column on the card. These data are then edited, and analysis begins.”