D

D (Latin Capital Letter D, U+0044) is the fourth letter of the basic Latin alphabet, representing the voiced alveolar plosive sound /d/ in English and many other languages. Visually, it features a strong vertical stroke on the left, connected to a large, curving bow that extends to the right, creating its characteristic rounded form. Historically, 'D' traces its roots back to the Phoenician letter Dalet, meaning "door," which evolved into the triangular Greek letter Delta (Δ) before adopting its present curved shape in the Latin alphabet. Beyond its phonetic role, 'D' serves as the Roman numeral for 500, a musical note, and a versatile symbol in mathematics and science, with its lowercase counterpart 'd' and various accented forms like Đ existing in extended Latin scripts.