# Coordinate system

A **coordinate system** is a system of numbers used to uniquely determine the position of a point. For two-dimensional systems, the numbers (scalars) are in ordered pairs. More dimensions call for more numbers.

For example, (3) is one-dimensional, (1, 4) is two-dimensional, (1, 5, 9) is three-dimensional, (2, 6, 5, 3) is four-dimensional, and (5, 8, 9, 7, 9) is five-dimensional.

## Coordinate System Media

The spherical coordinate system is commonly used in

*physics*. It assigns three numbers (known as coordinates) to every point in Euclidean space: radial distance*r*, polar angle*θ*(theta), and azimuthal angle*φ*(phi). The symbol*ρ*(rho) is often used instead of*r*.

## Related pages

- Analytic geometry
- Cartesian coordinate system
- Celestial coordinate system
- Polar coordinate system
- Spherical coordinate system