He was demonstrating the unwritten code we shared with our pilots.

But if these are unwritten codes, how would stakeholders be aware of them?

It was an unwritten code: Do not rock the boat.

But, once in a while, you get people who break free of the unwritten code.

It has always been an unwritten code of the military that we do not leave our people behind.

This language established itself as an unwritten code in the employment world.

He acknowledged few team policies or unwritten codes of conduct.

"We run into these unwritten codes of silence not only at the jail, but all over," he said.

And it is worth asking whether this unwritten code actually serves the public interest.

I guess I've never gotten that damned unwritten code out of my head.