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Delta (/ ˈ d ɛ l t ə /; [1] uppercase Δ, lowercase δ; Greek: δέλτα, délta, ) [2] is the fourth letter of the Greek alphabet. In the system of Greek numerals, it has a value of four. It was derived from the Phoenician letter dalet 𐤃. [3] Letters that come from delta include the Latin D and the Cyrillic Д.
Greek letters are used in mathematics, science, engineering, and other areas where mathematical notation is used as symbols for constants, special functions, and also conventionally for variables representing certain quantities. In these contexts, the capital letters and the small letters represent distinct and unrelated entities.
The symbol ϵ (U+03F5) is designated specifically for the lunate form, used as a technical symbol. The symbol ϑ ("script theta") is a cursive form of theta (θ), frequent in handwriting, and used with a specialized meaning as a technical symbol. The symbol ϰ ("kappa symbol") is a cursive form of kappa (κ), used as a technical symbol.
δ 13 C, a measure of the ratio of stable isotopes 13C:12C; δ 15 N, a measure of the ratio of stable isotopes 15N:14N; δ 18 O, a measure of the ratio of stable isotopes oxygen-18:oxygen-16; DeltaWing, a prototype racing car; High-leg delta, a three phase electrical circuit; Delta Delta Delta, a sorority; Delta function (disambiguation)
The symbol was introduced originally in 1770 by Nicolas de Condorcet, who used it for a partial differential, and adopted for the partial derivative by Adrien-Marie Legendre in 1786. [3] It represents a specialized cursive type of the letter d , just as the integral sign originates as a specialized type of a long s (first used in print by ...
Name Notes Άά: Alpha with acute: High pitch on short vowel or rising pitch on long vowel Ὰὰ: Alpha with grave: Archaic letter indicating normal or low pitch ᾶ: Alpha with circumflex: Archaic letter indicating high or falling pitch Ἀἀ: Alpha with smooth breathing: Archaic letter denoting the absence of /h/ prior to the vowel Ἄἄ
A mathematical constant is a key number whose value is fixed by an unambiguous definition, often referred to by a symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems. [1]
(non-Unicode name) ('Scarab' is an informal name for the generic currency sign) § Section sign: section symbol, section mark, double-s, 'silcrow' Pilcrow; Semicolon: Colon ℠ Service mark symbol: Trademark symbol / Slash (non-Unicode name) Division sign, Forward Slash: also known as "stroke" / Solidus (the most common of the slash symbols ...