[tang-soo]

Geeze, Louise - I misread that you had written 20 mm instead of 20 nm.

There is a slight difference between millimeters and nautical miles. :)

Also, a slight difference between millimeters and nanometers! :)

[meyer]

Newton-meters came to mind - too many times turning wrenches. The metric (inferior) equivalent of foot-pounds as a measure of torque when tightening screws, nuts, and bolts.