What's the noun for etiquettal? Here's the word you're looking for.
etiquette
The forms required by good breeding, or prescribed by authority, to be observed in social or official life; observance of the proprieties of rank and occasion; conventional decorum; ceremonial code of polite society.
The customarybehavior of members of a profession, business, law, or sports team towards each other.
A label used to indicate that a letter is to be sent by airmail.