Specific Relative Angular Momentum - Elliptical orbit
Gauge factor
Sauter mean diameter ( surface diameter)
Effective diffusivity in porous media
Buckingham-Reiner equation (Darcy friction factor for turbulent flow)
Auger electron spectroscopy - The Auger yield
Compartmental SIR model in epidemiology (basic reproduction number)
Rayleigh Number
Parallax
Gravitational Binding Energy - spherical mass of uniform density