Stealth notes

Ok, I just don't want to do this wrong, but my understanding of a stealth note is one where I enter the note on here, but do not stamp it. That correct?

That is Correct! It also is when anyone enters a note without stamping it and puts it back out into circulation.

Also, a note that HAS been stamped but NOT entered into the system is called an ORPHAN. (I know as I have actually unintentionally done this myself).