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Title Description
x-Intercept Where a graph crosses (intersects) the x-axis in rectangular or Cartesian coordinates is termed an X-Intercept.
x-y Plane The familiar coordinate plane.
The x-axis is almost universally horizontal; the y-axis is subsequently vertical.
Or, the Plane of X-Y in three-dimensional space with ordered triples (x, y, z).
x-z Plane In three dimensions, the plane orthogonal to the y-axis.
Xi The 14th letter of the Greek alphabet.

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