D (DISAMBIGUATION)

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

Contents

Science

Astronomy

General/other

Genetics

Physics

Mathematics

Computing

Arts and entertainment

Music

Other

Other uses

Science

Astronomy

★ D stands for the white dwarf stellar classification

★ D stands for destroyed/disappeared comet, as in D/1993 F2, Comet Shoemaker-Levy 9

★ D stands for a February 16 through 29 discovery, in the provisional designation of a comet or asteroid

General/other

★ D is the symbol for aspartic acid in biochemistry

★ D is the symbol of deuterium, an isotope of hydrogen, in chemistry

★ The D layer is part of the ionosphere in earth science

★ D stands for demand in economics

★ D is a standard size dry cell battery in electronics

★ D is the symbol for debye, a unit of electrical dipole moment

★ 'D' is the recommended symbol for electric displacement field

★ d (deci), is the SI prefix meaning one tenth, 10^-1

★ d is the symbol for day in metrology

★ D is a vitamin

Genetics

★ Haplogroup D (mtDNA) is a human mitochondrial DNA (mtDNA) haplogroup

★ Haplogroup D (Y-DNA) is a Y-chromosomal DNA (Y-DNA) haplogroup

Physics

★ d is the symbol of the deuteron in particle physics

★ D is the name of mesons containing charm quarks in particle physics

★ ''D'' is the recommended symbol for diffusion coefficient in molecular physics

★ ''d'' is 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

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★ ''D'' is the recommended symbol for the Debye-Waller factor

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★ D as a function of energy, D(E), or wavenumber, D(k), is a symbol for the density of states

Mathematics

★ ''d'' is the symbol for the total differential operator (partial differentials use ∂)

★ D is often used as a digit meaning ''thirteen'' in hexadecimal and other positional numeral systems with a radix of 14 or greater

★ Blackboard bold $mathbb\{D\}$ represents the unit disk in the complex plane, or the decimal fractions (see number)

★ ''d'' is often a variable for the diameter of a circle n geometry

★ ''D'' and ''d'' are the derivative operators

Computing

'D' is the name of various programming languages; see:

★ 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' may also refer to:

★ D is a security division ("Minimal Protection") in the TCSEC

★ D is shorthand for The D Conference: All Things Digital

Arts and entertainment

Music

★ D is a note

★ D (film) is a 2005 Bollywood film

★ "The D" is one of the names of comedy rock band Tenacious D

★ The Christian rock band Delirious? is often referred to as "d:" or "d:?"

★ D (Japanese band) is the name of a Japanese visual kei band

★ "D!" or "Dee!", names of Detlef Soost, a German dancer and choreographer

★ ''D (album)'' is a 2004 album by Japanese hard rock artist Des-ROW

Other

★ ''D Magazine'' is a magazine for the city of Dallas, Texas

★ In the manga and anime ''One Piece'', people with the middle initial "D" all have a sort of connection

★ D (video game) was a game released in the mid-1990s for the 3DO, PlayStation and Sega Saturn

★ Count D is a character in the anime/manga series ''Pet Shop of Horrors''

★ Vampire Hunter D is the title character in a series of novels by Hideyuki Kikuchi

★ D is one of the characters in ''Trace Memory''

★ ''Initial D'' is a Japanese manga and anime about mountain drifting that has spawned several arcade and console games

Other uses

★ In American politics, D is often used as an abbreviation for a Democrat

★ D is a brassiere cup size

★ In role-playing games, d is used to denote the number of sides of dice

★ In British currency, d is an abbreviation (from the Latin ''denarius'') for the pre-decimalization penny, worth 1/240th of a pound

★ In calendars, D is often an abbreviation for the month December

★ In education, D is a below average grade

★ In finance, D is the New York Stock Exchange ticker symbol for Dominion Resources

★ In international licence plate codes, D stands for Germany (''Deutschland'')

★ In motor vehicles, D (drive) designates the forward cruising gears in an automatic transmission

★ In radio, the NATO D band ranges from 1 to 2 GHz

★ In Roman numerals, D denotes the number five hundred. (There are also separate Unicode characters for this number, U+216E "Ⅾ" and U+217E "ⅾ")

★ In sports, D is often used as an abbreviation for defence

★ Amongst high-schoolers D is a name for the penis

★ D/ is used to denote the dominant person in a BSDM relation

★ On the serial numbers of United States dollars, D identifies the Federal Reserve Bank of Cleveland

★ D is the stock market symbol for Dominion Virginia Power

★ Substance D is a fictional recreational drug in the Philip K. Dick novel (and film of the same name), ''A Scanner Darkly''.