"INTELSAT" is not a term used in physics. It stands for International Telecommunications Satellite Organization, a multinational organization that provides global satellite communication services.

It's possible you're thinking of a term that is similar but used in physics, such as:

* Interferometer: An instrument that uses the interference of waves (light, radio waves, etc.) to make precise measurements.

* Intensity: A measure of the power per unit area carried by a wave.

Could you please clarify what you meant by "INTELSAT in physics"?