MEASURE FOR MEASURE

Some semi-empirical scales:

Fujita Scale of Tornado Intensity
Mercalli Scale of Earthquake Intensity
Richter Scale of Earthquake Magnitude
Mohs Scale of Mineral Hardness
Torino Meteorite Impact Hazard Scale
Schmidt Sting Pain Index
Saffir-Simpson Hurricane Scale
Hamilton-Norwood Scale of Male Pattern Baldness
Ludwig Scale of Female Pattern Baldness
Scoville Scale of Chile Pepper Hotness
Beaufort Wind Force Scale
Volcanic Explosivity Index
Glasgow Coma Scale

Thanks to JW