When describing coordinates in geometry, there are some synonyms for the commonly used term "polar-coordinate." These include "polar system," "polar representation," "polar axis," and "radial system." The polar-coordinate system is a method of defining a point in two-dimensional space using a radius and an angle measurement, rather than using traditional x and y coordinates. This system is particularly useful in describing circular or symmetric shapes. The polar-coordinate system is used in various fields such as mathematics, physics, and engineering. Using these synonyms for "polar-coordinate" helps to add variety to technical language and can aid in clear communication.