LeftGCD[a, b] gives the greatest common left divisor of the quaternions a and b.

PrimaryLeftAssociate[q] gives the left associate of the quaternion q with the largest scalar component.

PrimaryRightAssociate[q] gives the right associate of the quaternion q with the largest scalar component.

RightGCD[a, b] gives the greatest common right divisor of the quaternions a and b.

Bit is the fundamental unit of information.

Hertz is the derived SI unit of frequency.

"CopySpecial" is a front end token that converts the selection to a specified format and copies it to the clipboard.

StochasticMomentumIndex

Copy As opens a submenu to copy a selection and convert it to the specified format.

Initialization Group makes the cells in a group auto-evaluate whenever the notebook is opened and the kernel is launched.