Spin parameter

Spin parameter may refer to one of several different parameters in physics.

Black hole physics
One of two dimensionless parameters relating to black holes:
 * The spin parameter of an individual black hole, a variable with a value ranging from 0 to 1
 * The effective inspiral spin parameter for a pair of merging black holes, a variable with a value ranging from −1 to 1

Particle physics

 * The spin quantum number of an elementary particle, usually called just "spin", a constant with a value of $n⁄2$, where $n$ is a non-negative integer