Personally, I've heard it called the "customary system."
Believe it or not, the use of certain factors, such as 12 (inches to feet), 3 (feet to yards), or 4 (quarts to gallons) long ago gave a big advantage: easier divisibility by factors like 3 and 4. Ten does not divide evenly by those factors, but 12 does. This also justifies the Babylonian roots of our base-60 time system (seconds to minutes, etc.). The ancients were clever in basing measurements beyond our ten fingers. However, this is moot in contemporary times since today's technology can handle calculations almost effortlessly and precisely.
I add, however, that non-10-base systems are still used, in computer science and engineering no less. Long story short, keeping track of data sizes in programs is simpler using a base-2 system, as you probably know already. For example, a "kilobyte" would be 2^10 = 1024 bytes, right? In this case, SI is actually a disadvantage, as a kilobyte is still 1000 bytes, leading to the infamous confusion that occurs in buying hard drives, for example. In SI, 1024 bytes is called a kibobyte, with unit KiB.
I keep tabs on outside temperature in GNOME's respective applet using Kelvin.
Last edited 10/02/07(Sun)10:10.