Gy

Gy
An abbreviation of gray, the amount of energy actually absorbed in some material, and is used for any type of radiation and any material.
Gypsum
The old name for Calcium Sulphate.
Gyro
Abbreviation for Gyroscope.
Gyrofrequency
The natural period of revolution of a free electron in the earth′s magnetic field.
Gyroradius
Also known as Larmor Radius.
Gyroscope
A disc with a heavy rim mounted in such a way that its axis of rotation can adopt any position.
Gyrotron
A device for producing microwave energy that utilizes a strong axial magnetic field in a cavity resonator to produce azimuthal bunching of an electron beam.