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For the programming language, see D (programming language).

For technical reasons, the emoticon

D takes you here as

is an unsupported character.

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68;" and "&
100;" for upper and lower case respectively.

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In astronomy,

D stands for the white dwarf class of stars.

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

In biochemistry, D is the symbol for aspartic acid.

In chemistry, D is the symbol of deuterium, an isotope of hydrogen.

In Earth Science the atmosphere of Earth, the D layer is part of the ionosphere.

In economics, D stands for demand.

In education, D is a below average grade.

In electronics, D is a standard size dry cell battery.

In finance, D is the stock ticker symbol for Dominion Resources.

In geometry, d is often a variable for the diameter of a circle.

In 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 $mathbb$ represents the unit disk in the complex plane, or the decimal fractions (see numbers).

In metrology, d is the symbol for day (from the Latin dies; this is the only symbol for this unit acceptable for use with SI)

In nutrition, D is a vitamin.

In physics:

In particle physics, d is the symbol of the deuteron.

In molecular physics, D is the recommended symbol for: diffusion coefficient

In molecular spectroscopy, d is the recommended symbol for: thickness, diameter, relative density (mechanics), lattice plane spacing (solid state physics), and degeneracy of vibrational mode.

In solid state physics, D is the recommended symbol for: Debye-Waller factor.

D is the recommended symbol for electric displacement.

In the SI system, d, deci, is the SI prefix meaning one tenth, 10^-1.

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

Brassiere cup size D

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 computing,

D is the name of various programming languages, most notably the D programming language by Walter Bright.

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

In driving a motor vehicle, D (drive) designates the forward cruising gears in an automatic transmission.

In finance, D is the New York Stock Exchange ticker symbol for the Richmond, Virginia company Dominion.

In international licence plate codes, D stands for Germany.

In music, D is a note.

In print, D Magazine is a magazine for the city of Dallas, Texas.

In radio,

the NATO D band ranges from 1 to 2 GHz.

In the manga and anime One Piece, people with the middle inital 'D' all have a sort of connection.

In Roman numerals, D denotes the number 500 (there are also separate Unicode characters for this number, 0x216E "Ⅾ" and 0x217E "ⅾ").

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

In video games, D is the title of a game released in the mid-1990s for PlayStation.

D is also the name of a Japanese Visual Kei band.

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

Count D is also the name of a character in the anime/manga series, Pet Shop of Horrors.

D is also the name of the main character of Vampire Hunter D

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Eth (Ð, ð)

D with stroke (Đ, đ)