In physics, the gyromagnetic ratio (also sometimes known as the magnetogyric ratio in other disciplines) of a particle or system is the ratio of its magnetic moment to its angular momentum, and it is often denoted by the symbol Gamma|, gamma. Its SI unit is the radian per second per tesla (rad&sdot;s&sdot;T) or, equivalently, the coulomb per kilogram (C&sdot;kg).
The term "gyromagnetic ratio" is often used as a synonym for a different but closely related quantity, the -factor. The -factor only differs from  the gyromagnetic ratio in being dimensionless.