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The fourth letter of the modern Greek alphabet Δ, δ.
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A landform at the mouth of a river where it empties into a body of water.
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(international standards) Alternative letter-case form of Delta from the NATO/ICAO Phonetic Alphabet.
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(mathematics, physics, engineering) The symbol Δ; A change in a quantity, likely from "d" for "difference".
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(finance) The rate of change in an option value with respect to the underlying asset's price.
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(chemistry) A value in delta notation indicating the relative abundances of isotopes.
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(computing) The set of differences between two versions of a file.
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(computing, informal) A small but noticeable effect. Compare epsilon.
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(surveying) The angle subtended at the center of a circular arc.
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A type of cargo bike that has one wheel in front and two in back.
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(electrical, often attributive) The closed figure produced by connecting three coils or circuits successively, end for end, especially in a three-phase system.
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(US, military, U.S. Space Force) A military unit, nominally headed by a colonel, equivalent to a USAF operations wing, or an army regiment.
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(astronomy) a star that is usually the fourth brightest of a constellation.
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(physics) one of four baryons consisting of up and down quarks with a combined spin of 3/2: Δ⁺⁺ (uuu), Δ⁺ (uud), Δ⁰ (udd), or Δ⁻ (ddd)
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(medicine) Short for delta variant. (variant of the SARS-CoV-2 virus)