If you’re curious about math terms that start with the letter “U,” this article will list and explain them for you.

**Union:**The set containing all elements from two or more sets.**Unit:**A single complete entity or quantity used as a standard of measurement.**Uniform:**Identically the same in multiple instances.**Unimodal:**Having a single mode or peak.**Unary:**Involving only one element or component.**Unbounded:**Not confined within limits; limitless.**Universal Set:**The set that contains all objects under consideration.**Upper Bound:**The highest value in a range or set.**Unit Circle:**A circle with a radius of one, centered at the origin.**Unit Matrix:**A square matrix with ones on the diagonal and zeros elsewhere.**U-**substitution**: A method for solving integrals by substituting variables.**Utility:**A measure of preference or satisfaction.

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