The fourth letter of the modern Greek alphabet Δ, δ.
A landform at the mouth of a river where it empties into a body of water.
The letter D in the ICAO spelling alphabet, which assigns words to letters of the alphabet.
The symbol Δ.
A small but noticeable effect. Compare epsilon.
The set of differences between two versions of a file.
A change in a quantity, likely from "d" for "difference".
The angle subtended at the center of a circular arc.
A type of cargo bike that has one wheel in front and two in back.
The closed figure produced by connecting three coils or circuits successively, end for end, especially in a three-phase system.
The rate of change in an option value with respect to the underlying asset's price.
A value in delta notation indicating the relative abundances of isotopes.
(U.S. Space Force) A military unit, nominally headed by a colonel, equivalent to a USAF operations wing, or an army regiment.