Once upon a time a local newspaper columnist ran a little puzzle contest a` la "26 L of the A means what?" type. He had the foresight to include in the instructions the disclaimer "The correct answers are the ones kept in the top right-hand drawer of my office desk."

There doesn't seem to be much consistency in the way people - even professionals - refer to these things. We could (just did) spend a lot of time pointing out all the examples of this, I suppose.