The Appendix b of the Measurement Uncertainty Guide [2] rather faithfully follows the famous (or infamous) ISO Guide to Uncertainty in Measurement (GUM) and provides a very useful collection of terms, definitions for the vocabulary used by those involved in the profession of measurement. So, have a taste of some ISO GUM! It'll make your teeth white, your life bright and everthing right with the world! Of course, you'll run the risk of becoming a true geek speaker. But isn't that what it's all about?