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In human anatomy, the vertebral column (backbone or spine) is a column of 24 vertebrae, the sacrum, intervertebral discs, and the coccyx situated in the dorsal aspect of the torso, separated by spinal discs. It houses the spinal cord in its spinal canal.

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Precalculus, an advanced form of secondary school algebra. Courses and textbooks in precalculus are intended to prepare students for the study of calculus.
Precalculus typically includes a review of algebra and trigonometry, as well as an introduction to exponential, logarithmic and trigonometric functions, vectors, complex numbers, conic sections, and analytic geometry.

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