Cusp

Cusp may refer to any of the following:

In common parlance, a cusp is an important moment usually regarded as a decision point upon which consequent events are determined. More literally, a cusp is a sharp point or apex, such as occurs in two dimensions at the end of a crescent, or in three dimensions at the tip of a cone or horn. A number of technical terms are derived from it.
In mathematics, a cusp might mean:
* a singular point of a curve;
* a conical singular point seen in hyperbolic geometry;
* a missing point on a modular curve that has to be supplied by compactification;
*a cusp form in modular form theory.
In astrology, a cusp is a boundary between zodiac signs and houses.
In dentistry, a cusp is any of the points on a cuspid (canine tooth) or molar.
CUSP is a novel by Robert A. Metzger.

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