zip code

Code or code-word...that's all I can answer.

Code or Morse Code.

In telecommunication, a code word is the element of a code. Each code word is a sequence of symbols that, when assembled in accordance with the code, come together to form a word or phrase that has specific meaning. Often times, the code word is not decipherable unless the one trying to decipher it has a specific code book that contains the procedure for deciphering the code.

So the CODE word of the day is what?