Gilbert (Gb)
The gilbert (Gb) equals 0.7957747151 ampere-turn — the CGS unit of magnetomotive force, related to oersted and the CGS magnetic system.
Gilberts appear in legacy magnetics literature and CGS-based magnetic circuit calculations alongside oersteds.
Ampere Turn (A·t)
The ampere-turn (A·t) is the SI unit of magnetomotive force (MMF) — the magnetic equivalent of electromotive force, equal to one ampere flowing in one turn of a coil.
Ampere-turns quantify the driving force that establishes magnetic flux in inductors, transformers, and electromagnets.