Using Code Names

I was just getting in a ride on the trainer and heard a great tip on a show I was watching. If your business is anything like ours, you likely do some of your work under an NDA - Non Disclosure Agreement. Essentially, this means you can't tell anyone for whom your working.
To make it so you can still talk about "the company" assign them a code name. Use the code name in all correspondence and in all conversations. This way everyone in your company can talk about "the company", and they all know to whom you're referring - but outsiders are none the wiser.
Given that I recently made such a faux pas, I'm definitely going to start using this practice. My first code name... "General Lee".