An axis (pl.: axes) may refer to: Mathematics. A specific line (often a directed line) that plays an important role is some contexts. In particular: Coordinate axis of a coordinate system. x-axis, y-axis, z-axis, common names for the coordinate axes of a Cartesian coordinate system. Axis of rotation. Axis of symmetry. Axis of a conic section. Politics. Axis powers of World War II, 1936–1945. Axis of evil (first used in 2002), U.S. President George W. Bush's description of Iran, Iraq, and North Korea. Axis of Resistance (first used in 2002), the Shia alliance of Iran, Syria, and Hezbollah.
https://en.wikipedia.org/wiki/Axis