One class of devices whose final measured output is this quantity can have “herringbone” or “barber pole” geometries, which contrast with the multilayer CIP and CPP configurations. To improve sensitivity, optically pumped devices for measuring this quantity may use a very dense gas of alkali metal atoms to prevent decoherence, thus operating in the SERF regime. Another device whose final measured output is this quantity comes in (*) RF and DC types, the latter of which consists of a superconducting loop with two Josephson junctions (10[1])in parallel. SQUIDs measure this quantity, (10[1])external values of which produce a transverse voltage in a Hall effect sensor. Inductive sensors detect the current produced in a coil to measure, for 10 points, what quantity, whose SI unit is the Tesla? ■END■ (10[1])