The story
After English physicist John Henry Poynting (1852–1914).
Etymology from Wiktionary, CC BY-SA 4.0.
Poynting vector
Today it means: 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. Full definition →