Alphabet (formal languages)
NON-EMPTY SET OF SYMBOLS OR LETTERS IN COMPUTER SCIENCE AND MATHEMATICAL LOGIC
Input symbol; Alphabet (computer science); Alphabet (mathematics); Character alphabet
In formal language theory, an alphabet is a non-empty set of symbols/glyphs, typically thought of as representing letters, characters, or digits but among other possibilities the "symbols" could also be a set of phonemes (sound units). Alphabets in this technical sense of a set are used in a diverse range of fields including logic, mathematics, computer science, and linguistics.