Any letter can be used.
Some common letters are:
N for Natural numbers
Z for Integers (from German Zahl)
Q for Rational numbers (quotient)
R for Real numbers
C for Complex numbers
A, B, C, S, T etc for general sets
U for the Universal set.
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There is not a specific word that is used to bold a number in a math equation. Generally, a number or letter is not bold in a math equation, if a letter is of significance, it is normally capitalized.
volume integral
math is used to show people the different ways math can be used such as fractions or decimals you name it
Letters used in math are called variables.
A term often used is "evaluate".