In physics, the Poynting vector represents the directional energy flux or power flow of an electromagnetic field. Wikipedia

A representation of the energy flux of an electromagnetic field Wikipedia Disambiguation

Measure of directional energy flux Wikidata

The vector obtained in the direction of a right-hand screw from the cross product (vector product) of the electric field vector rotated into the magnetic field vector of an electromagnetic wave. Note: The Poynting vector, with transmission media parameters and constants, gives the irradiance and direction of propagation of the electromagnetic wave. Mathematically: P → = E → × H → . Wiktionary