In music, the sharp sign (#) that raises a note by a semitone; also a printer's mark or symbol.
From Latin diesis, from Greek diesis meaning 'a quarter-tone.' Originally referred to the smallest interval in ancient Greek music theory, later adapted to mean the sharp sign in modern musical notation.
The diese symbol started as a mathematical concept in ancient Greek music theory, representing minute pitch differences that were crucial to their sophisticated understanding of harmony. It's fascinating how this tiny symbol carries thousands of years of musical evolution!
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