Meanings of unwritten code in English

So here's the unwritten code of conduct: Find somewhere you love?

They have some unwritten code that turns toilets into social hang-outs.

Don't ask, don't tell and don't care was the unwritten code of the day.

I said, Look, it's the unwritten code of the JAG Corps-neversurprise each other.

And in the unwritten code governing his decisions all offences had a common penalty-death

That was against the unwritten code of the weedies.

Swiss bankers have long adhered to an unwritten code similar to that observed by doctors or priests.

There was an unwritten code among the owners and management of the larger companies on the riverfront.

Now even the one dubious remnant of personal honor, according to crime's unwritten code, is swept away.

It was a stunning and rare public rebuke among teammates, a violation of the unwritten code among teammates.

Thus the unwritten code remains in a measure hostile to the accepted laws which are supposed to rule.

This unwritten code has its origin, as have all Oriental traditions and concepts, in the teachings of religious systems.

Now, according to the unwritten code of the plains, lynching was "meet, right, just, and available" for the cattle-thief.

Their unwritten code of propriety on the subject seems to be, "You must see, but you may not observe."

Strip clubs don't exactly attract male feminists, and by unwritten code, what happens in the strip club stays in the strip club.

Traders there who spoke to Reuters said the two jewellers had acquired a reputation for not following the industry's unwritten code of business ethics.