word:

et·i·quette
–noun

1.conventional requirements as to social behavior; proprieties of conduct as established in any class or community or for any occasion.

2.a prescribed or accepted code of usage in matters of ceremony, as at a court or in official or other formal observances.

3.the code of ethical behavior regarding professional practice or action among the members of a profession in their dealings with each other: medical etiquette.

(taken from dictionary)