Information about Cusps

cusp is a singular point of a curve. Spinode is an alternative name, but this is less commonly used today.

For a curve defined as the zero set of a function of two variables , the cusps on the curve will have the following properties:

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In number theory, a branch of mathematics, a cusp form is a particular kind of modular form, distinguished in the case of modular forms for the modular group by the vanishing in the Fourier series expansion

of the constant coefficient a
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In number theory, cuspidal representations are certain representations of algebraic groups that occur discretely in spaces. The term cuspidal is derived, at a certain distance, from the cusp forms of classical modular form theory.
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cusp is an occlusal or incisal eminance on a tooth.

Canine teeth, otherwise known as cuspids, each possess a single cusp, while premolars, otherwise known as bicuspids, possess two each. Molars normally possess either four or five cusps.
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The cusps of the heart valves serve to seal the heart valves when closed. There are normally three cusps for each valve except the mitral valve (hence its alternate name, "bicuspid valve".)

"Nodules" are located at the tip of the valve, to form a tighter seal.
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In astrology, a cusp (from the Latin for spear or point) is the imaginary line that separates a sign in the zodiac or a house in the horoscope.

If an individual was born when the Sun (meaning the point at the centre of the solar disc) was located at 29 degrees, 50 minutes
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Cusp is a science fiction novel written by Robert A. Metzger, in the category of hard science fiction. It deals with two perpendicular rings running along the Earth's surface, that act as cosmic jets, using ionized hydrogen.
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