Definition:Polar Coordinates/Polar Axis

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Let $O$ be the pole of the polar coordinate plane.

A ray is drawn from $O$, usually to the right, and referred to as the polar axis.

Also known as

Some sources refer to the polar axis as the initial line.

Some use the term initial vector.

Linguistic Note

The plural of axis is axes, which is pronounced ax-eez not ax-iz.

Compare basis.