Most schools have a code of conduct. It would be the way they expected you to behave as you are attending that school. Business have a similiar code. Maybe not as strict but it informs you of how they expect you to act in order to present their business in the best light to the public. Places like the US Naval Academy have a very strict code of conduct which will earn demerit points if you are caught breaking any part of the code.
It is a standard, normally high, that a person or group of people adhere to.
Code of conduct is a set of conventional principles or expectations that are considered binding on any person who is a member of a particular group