Angular momentum

measure of the extent to which an object will continue to rotate in the absence of an applied torque

quantum number for an atomic orbital that determines its orbital angular momentum and describes the shape of the orbital, and is symbolized as ℓ

quantum mechanical operator related to rotational symmetry

quantum number describing the total angular momentum of an atom

vector quantity in celestial mechanics

coupling in quantum physics

angular momentum in special and general relativity

Yrast ( , ) is a technical term in nuclear physics that refers to a state of a nucleus with a minimum of energy (when it is least excited) for a given angular momentum. Yr is a Swedish adjective sharing the same root as the English whirl. Yrast is the superlative of yr and can be translated whirlingest, although it literally means "dizziest" or "most bewildered". The yrast levels are vital to understanding reactions, such as off-center heavy ion collisions, that result in high-spin states.