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Math Glossary Letter U
undulating numbers
noun
In base 10, numbers with the form ababa

12121, 3737373
unicode
noun
Unicode is a computing industry standard for the consistent encoding and handling of text
uniform
noun
In the same manner
uniform distribution
noun
Statistical distribution with constant probability

M = 1/(b - a)
unigram
noun
n-gram of size one
union
noun
Combine the elements of two or more sets
unit circle
noun
A circle centered at the origin (0, 0) with a radius of 1

x2 + y2 = 1
unit cost
noun
a total expenditure incurred by a company to produce, store, and sell one unit of a particular product or service

Unit Cost = Total Money Value/Total Units (or Quantity)
unit fraction
noun
A fraction with 1 as the numerator

For fractions n/m, the unit fraction is 1/m
unit vector
noun
A vector with a magnitude of one

[0, 1] or [1, 0]
units of output depreciation
noun
Depreciation based on asset usage
unix time
noun
The number of seconds since January 1, 1970
unknown
noun
a number or value we do not know
unknown number
noun
Also known as a variable
unordered partitions
noun
A partition is unordered when no distinction is made between subsets of the same size (the order of the subsets does not matter
unsigned integer
noun
an integer that can only be positive
upper bound
noun
Any number greater than or equal to all elements in a set.
upper quartile
noun
The top 25% of data set values
upsilon
noun
A letter of the greek alphabet used for math notation.

Υ  υ
utility
noun
Preference for goods and services above money