WAbbe number
WBrinell scale
WContrast (vision)
WCorrelation and dependence
WF-number
WFine-structure constant
WInverse trigonometric functions
WNelson complexity index
WParts-per notation
WPassenger load factor
WPoisson's ratio
WProbability
WQuantum number
WReflectance
WReflection coefficient
WRefractive index
WReynolds number
WRockwell scale
WShore durometer
WTotal internal reflection
WTransparency and translucency
WTrigonometric functions
WWeber number