a
Symbol  Format  Data 

a  Code Point 

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The latin letter a is used to represent a variable or coefficient.
The capital Latin letter A is used in mathematics as a variable. In linear algebra, the symbol is used to represent a matrix. In probability, the symbol is used to represent a random variable.
A variable is a core concept in algebra where a symbol, usualy a lower case latin letter, is used as a placeholder in a math expression.