Colour-coded and Coding

noun

• Act of writing in code or cipher.
  • synonyms: cryptography, secret writing, steganography

verb

• Attach a code to.
  • usage: "Code the pieces with numbers so that you can identify them later"
  • synonyms: code
• Convert ordinary language into code.
  • usage: "We should encode the message for security reasons"
  • synonyms: code, encipher, cipher, cypher, encrypt, inscribe, write in code

In accounting, is the assignation of the proper account code to invoices.