Axis

Axis has several uses:

In mathematics, an axis is a straight line around which a geometric figure can be rotated. An axis of symmetry is a line with respect to which a body can be symmetrical. The term is also applied for the axis of a graph; the horizontal axis x-axis, the vertical y-axis and the z-axis is a possible third axis used for three-dimensional graphing.

In anatomy, the axis (C2) is the second cervical vertebra of the spine. Its articulation with the bone above, the atlas, allows rotation, and its articulation with the bone below (C3) allows a lesser degree of flexion, tilting and rotation.

In politics, Axis (often capitalized) can also be used to denote an alliance or partnership between states. A historical example are the Axis Powers during World War II who where fought by the Allies. In 2002 George W. Bush popularized the controversial term Axis of Evil.

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