Definition:Letter of Alphabet

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Definition

A letter is one of the symbols of the alphabet of a natural language.

The letters of the English alphabet, for example, are:

$\texttt {A B C D E F G H I J K L M N O P Q R S T U V W X Y Z}$
$\texttt {a b c d e f g h i j k l m n o p q r s t u v w x y z}$