A line with a chosen Cartesian system is called a number line.

But there are many Cartesian coordinate systems on a Euclidean space.

It can then be applied on a graph where you us a two dimensional Cartesian coordinate system.

Consider two dimensional plane flow within a Cartesian coordinate system.

After finding the solution it can be transformed back to the original three dimensional Cartesian coordinate system.

Using the Cartesian coordinate system it can be expressed as:

The name is a pun on the Cartesian three-dimensional coordinate system.

Thus, at the level of the final common path, eye movements are encoded in essentially a Cartesian coordinate system.

The two tensors and are in a Cartesian coordinate system of the form:

As a result, one obtains the 2-dimensional Cartesian coordinate system.