D (disambiguation)

Contents 1 Science 1.1 Astronomy 1.2 General/other 1.3 Genetics 1.4 Physics 2 Mathematics 3 Computing 4 Arts and entertainment 4.1 Music 4.2 Other 5 Other uses

D is the fourth letter of the Latin alphabet. It can also refer to the following:

Science

Astronomy

• D, the white dwarf stellar classification
• D/, for "destroyed/disappeared" in comet nomenclature
• D, a February 16 through 29 discovery in the provisional designation of a comet or asteroid

General/other

• D, the symbol for aspartic acid in biochemistry
• D, the symbol of deuterium, an isotope of hydrogen, in chemistry
• D layer, part of the ionosphere in earth science
• D, standing for demand in economics
• D, a standard size dry cell battery in electronics
• D, the symbol for debye, a unit of electrical dipole moment
• <math>\mathbf{D}</math>, the recommended symbol for electric displacement field
• d (deci), the SI prefix meaning one tenth, 10^-1
• d, the symbol for day in metrology
• Vitamin D

Genetics

• Haplogroup D (mtDNA), a human mitochondrial DNA (mtDNA) haplogroup
• Haplogroup D (Y-DNA), a Y-chromosomal DNA (Y-DNA) haplogroup

Physics

• d, the symbol of the deuteron in particle physics
• D, the name of mesons containing charm quarks in particle physics
• D, the recommended symbol for diffusion coefficient in molecular physics
• d, the recommended symbol for: thickness, diameter, relative density (mechanics), lattice plane spacing (solid state physics), and degeneracy of vibrational mode, in molecular spectroscopy
• In solid state physics:
  • D, the recommended symbol for the Debye-Waller factor
  • D as a function of energy, D(E), or wavenumber, D(k), a symbol for the density of states

Mathematics

• d, the symbol for the total differential operator (partial differentials use ∂)
• D, often used as a digit meaning thirteen in hexadecimal and other positional numeral systems with a radix of 14 or greater
• Blackboard bold <math>\mathbb{D}</math>, representing the unit disk in the complex plane, or the decimal fractions (see number)
• d, often a variable for the diameter of a circle in geometry
• D and d, the derivative operators

Computing

• D, the name of various programming languages:
  • D (programming language), created by Walter Bright as a successor to C++
  • Tutorial D, a database query language proposed by Christopher J. Date and Hugh Darwen
  • Dialog Manager programming language
  • The Data Language, an MS-DOS 4GL
  • D functional programming language, a Haskell-like language, with type classes
  • D programming language (Sun), designed to be used with the DTrace dynamic tracing framework
• Filetab-D, a language based on decision tables
• D, a security division ("Minimal Protection") in the TCSEC
• D, a shorthand for The Wall Street Journal's
• D (data language specification), the basis for Tutorial D and others

Arts and entertainment

Music

• D (musical note)
• The D major scale or chord
• The D minor scale or chord
• The prefix "D." to a piece of music by Franz Schubert, indicating its number in the catalogue of Otto Deutsch
• "The D", one of the names of comedy rock band Tenacious D
• "d:" or "d:?", often used to refer to the Christian rock band Delirious?
• D (Japanese band), a Japanese visual kei band
• "D!" or "Dee!", names of Detlef Soost, a German dancer and choreographer
• D (album), a 2004 album by Japanese hard rock artist Des-ROW
• D, the bass player for Australian band Testeagles

Other

• D (film), a 2005 Bollywood film
• D Magazine, a magazine for the city of Dallas, Texas
• The middle initial "D" in the manga and anime One Piece, indicating people with a sort of connection
• D (video game), a game released in the mid-1990s for the 3DO, PlayStation and Sega Saturn
• Count D, a character in the anime/manga series Pet Shop of Horrors
• Vampire Hunter D, the title character in a series of novels by Hideyuki Kikuchi
• D, one of the characters in Trace Memory
• Initial D, a Japanese manga and anime about mountain drifting that has spawned several arcade and console games

Other uses

• D, in American politics, often used as an abbreviation for a Democrat
• D, a brassiere cup size
• d, used in role-playing games to denote the number of sides of dice
• d, an abbreviation in British currency (from the Latin denarius) for the pre-decimalization penny, worth 1/240th of a pound
• D, in calendars an abbreviation for the month December
• D, a below average grade in education
• D, the New York Stock Exchange ticker symbol for Dominion
• D, Germany (Deutschland) in international licence plate codes
• D (drive), the forward cruising gears in an automatic transmission
• D (New York City Subway service), a service on the New York City Subway
• In radio, the NATO D band, ranging from 1 to 2 GHz
• D, the number five hundred in Roman numerals
• D, often used in sports as an abbreviation for defence
• D/, used to denote the dominant person in a BSDM relation
• D, denoting the Federal Reserve Bank of Cleveland in the serial numbers of United States dollars
• Substance D, a fictional recreational drug in the novel and film A Scanner Darkly
• D, an alternative written from of the character 啲 In Hong Kong
• superscript ^D is the abbreviation for the determiner DINGIR "god" in cuneiform transcription.

Latin letter disambiguation
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