Triple Point
A point where a curve intersects itself along three arcs. The above plot shows the triple point at the Originof the Trifolium 
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References
Walker, R. J. Algebraic Curves. New York: Springer-Verlag, pp. 57-58, 1978.
- Ulam Sequence
- Ulam's Problem
- Ultrametric
- Ultraradical
- Ultraspherical Differential Equation
- Ultraspherical Function
- Ultraspherical Polynomial
- Umbilic Point
- Umbral Calculus
- Umbrella
- Unambiguous
- Unbiased
- Uncia
- Uncorrelated
- Uncountable Set
- Uncountably Infinite Set
- Undecagon
- Undecidable
- Undecillion
- Undetermined Coefficients Method
- Undulating Number
- Unduloid
- Unexpected Hanging Paradox
- Unfinished Game
- Unhappy Number