In magnetics, the maximum energy product is an important figure-of-merit for the magnetic strength of magnetic materials used to make permanent magnets. It is often denoted max and is typically given
(BH)max can be graphically defined as the area of the largest rectangle that can drawn in the second quadrant of the B-H loop.
The gauss is a unit of measurement of magnetic flux density, B. The unit is part of the Gaussian system of units, which inherited it from the older centimetre–gram–second electromagnetic units system.
Carl Friedrich Gauß in 1828, aged 50 years old