What do the different shaped icons on the Satellite polar plot of Quantum Display represent?

The Satellite Polar Plot displayed in Quantum uses different-shaped icons, with each type of shape representing a specific satellite constellation.

Satellite polar plot

These shapes and their representations are as follows:

Circle:  GPS satellite

Square: GLONASS satellite

Diamond: Galileo satellite

Triangle: Beidou satellite  

Satellite shaped: Inmarsat Communication satellite (25E, IOR, etc.)