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Many letters of the Latin alphabet, both capital and small, are used in mathematics, science and engineering to denote by convention specific or abstracted constants, variables of a certain type, units, multipliers, physical entities. Certain letters, when combined with special formatting, take on special meaning.
Below is an alphabetical list of the letters of the alphabet with some of their uses. The field in which the convention applies is mathematics unless otherwise noted.
I, U, Middle Ages, E, Phoenician alphabet
ᚁ, Z, N, E, A
Celsius, Action (physics), Delta (letter)
Axiom of Choice, Set theory, Definition, Integral, Gradient