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Delta (Letter)Delta (upper case Δ, lower case δ) is the fourth letter of the Greek alphabet. In the system of Greek numerals it has a value of 4. A river delta is named after the letter delta because it has roughly the triangular shape of the upper-case delta. The upper-case letter Δ is used as the symbol for: Deltas are the second lowest caste in Aldous Huxley's dystopic satire Brave New World. The lower-case letter δ is used as the symbol for: - A microscopic change in the value of a variable in mathematics or science.
- The Kronecker delta in mathematics.
- The Dirac delta function in mathematics.
- A mark for deletion in proofreading. The usage is said to date back to classical times.
Letters that arose from Delta include the Roman D and the Cyrillic letter De.
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