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"What I have in my stories is ethics. Ethics and morality are very different cups of tea. I adhere to a very strict rigor of personal ethics and I demand it of those around me as well."
- Harlan Ellison

Radioactive Coding for Checks  
  Special coding system to easily recognize checks.  

One real improvement I had not appreciated up to then was the universal checkbook system; with a single cybernet as clearinghouse for the whole city and radioactive coding on my checkbook, I got cash laid in my palm as quickly there as I could have gotten it at my home bank across from Hired Girl, Inc.
From The Door Into Summer, by Robert Heinlein.
Published by Fantasy & Science Fiction in 1956
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Additional resources:
  More Ideas and Technology from The Door Into Summer
  More Ideas and Technology by Robert Heinlein
  Tech news articles related to The Door Into Summer
  Tech news articles related to works by Robert Heinlein

Radioactive Coding for Checks-related news articles:
  - Marie Curie's Papers Still Radioactive

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Grow Wood Without Trees
Pretty soon, you'll start seeing this term on very expensive items.

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