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.
CUSP is a bikeriders group. Customeiros de São Paulo - Brazil. (http://br.groups.yahoo.com/group/custom_sp/)
This disambiguation page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article.
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.
The term cuspform in modular form theory refers to the third of these meanings, implying a form that vanishes at cusps.
In a separate field, cusp is a term in astrology for the boundary day(s) between zodiac signs.