To represent variables you don't know, or could be anything.
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There is no good reason: it is simply a convention.
algebra is the use of letters in an algebraic expression. Chloroform is a type of
That is called "algebra".That is called "algebra".That is called "algebra".That is called "algebra".
Roman numerals use letters in place of numbers. An unknown variable in algebra uses a letter instead of a number.
all the letters in the alphabet are used to represent variables in algebra. also in some advanced mathematics letters from the greek alphabet are used.