ScalarQ (Quaternions Package Symbol)

ScalarQ[q] gives True if q is a real numeric quantity and False otherwise.

ToQuaternion (Quaternions Package Symbol)

ToQuaternion[q] transforms q into a Quaternion object if possible.

UnitQuaternionQ (Quaternions Package Symbol)

UnitQuaternionQ[q] gives True if q is a unit quaternion and False otherwise.

Deuterium (Resonance Absorption Lines Package Symbol)

Deuterium is an isotope of hydrogen.

CollisionFrequency (Standard Atmosphere Package Symbol)

CollisionFrequency[altitude] gives the collision frequency at the specified altitude altitude.

KineticTemperature (Standard Atmosphere Package Symbol)

KineticTemperature[altitude] gives the kinetic temperature at the specified altitude altitude.

Statistical Plots Package (Statistical Plots Package Guide)

ArcMinute (Units Package Symbol)

ArcMinute is a unit multiplier.

ArcSecond (Units Package Symbol)

ArcSecond is a unit multiplier.

Atto (Units Package Symbol)

Atto is the SI unit prefix denoting 10 -18.