D is the fourth letter of the Latin alphabet.
D or d may also refer to:
Places
People with the name
- D, the bass player for Australian band Testeagles
- "D!" or "Dee!", names of Detlef Soost, a German dancer and choreographer
- D, nickname of Indian actor Darshan (Kannada actor)
- D, nickname of Indian actor Dhanush (cf. D50 (film))
Arts, entertainment, and media
Fictional entities
- D, a character in a series of novels titled Vampire Hunter D by Hideyuki Kikuchi
- D, a nickname given to Count Dracula in the novel Dracula written by Bram Stoker
- D, one of the characters in Another Code: Two Memories (Trace Memory)
- Count D, a character in the anime/manga series Pet Shop of Horrors
- Substance D, a fictional recreational drug in the novel and film A Scanner Darkly
Games
- D (video game), a game released in 1995 for the PC, 3DO, PlayStation and Sega Saturn
Music
Groups and labels
- D (band), a Japanese rock/metal band
- D Records, a former record label in Houston, Texas, US
- "d:" or "d:?", often used to refer to the Christian rock band Delirious?
- "The D", one of the names of comedy rock band Tenacious D
Albums
- D (Deuter album), 1971
- D (Daryl Hall album), 2024
- D (Os Paralamas do Sucesso album), 1987
- D (White Denim album), 2011
- D (single album), by Big Bang, 2015
- D, followed by a number, a composition by Franz Schubert according to the Schubert Thematic Catalogue
- Substance D, a drum and bass compilation album by Dieselboy
Other uses in music
- D (musical note)
- D major, a scale
- D major chord; See Chord names and symbols
- D minor, a scale
- Steinway D-274 or D, a concert grand piano model manufactured by Steinway & Sons
- "D", a song by Little River Band from their album Playing to Win
Periodicals
- D, a weekly supplement to the Italian newspaper la Repubblica
- D Magazine, a magazine for the city of Dallas, Texas, US
Other uses in arts, entertainment, and media
- D (film), a 2005 Bollywood film
- Initial D, a 1995 Japanese manga and anime about mountain drifting that has spawned several arcade and console games
- D, the production code for the 1964 Doctor Who serial Marco Polo
- "D" Is for Deadbeat, the fourth novel in Sue Grafton's "Alphabet mystery" series, published in 1987
- The D logo for the Russian television channel Domashny
Business and economics
- Demand (D), in economics
- Dominion Resources (New York Stock Exchange ticker symbol D)
- Federal Reserve Bank of Cleveland (serial numbers of United States dollars, beginning with D)
- Penny (British pre-decimal coin) (d)
Computing, technology, and engineering
Computing
- .d, a file format used for Agilent MassHunter mass spectrometry software
- .d, a pathname component suffix for a directory; for example with the init program
- -d, a suffix of a daemon, a computer program that runs as a background process
- D - Minimal Protection, a security division in the Trusted Computer System Evaluation Criteria
Programming languages
- D (programming language), a C++-like programming language developed by Walter Bright
- D, a programming language designed to be used with the DTrace dynamic tracing framework
- Hugh Darwen's Tutorial D, part of a proposed family of database query languages called "D"
Other uses in technology
- D, Mitsubishi Electric's mobile phones in Japan
- D battery, a standard size dry cell battery in electronics
- d', sensitivity index, a statistic used in signal detection theory
Linguistics
- ’d, a contraction of the English words had and would
- Dingir (), the Sumerian sign for deity
- or /d/, Voiced alveolar stop consonant in the International Phonetic Alphabet
Mathematics and science
Measurements
- d, deci-, SI prefix factor 0.1
Astronomy and Earth science
- D, a February 16 through 29 discovery in the provisional designation of a comet or asteroid
- D, for "Degenerate", a white dwarf in stellar classification
- D/, for "destroyed/disappeared" in comet nomenclature
- D region, part of the ionosphere
Mathematics
- D, 500 in Roman numerals
- D, Thirteen, or D in hexadecimal and other positional numeral systems with a radix of 14 or greater
- D and d, the derivative operators
- d, the symbol for the total differential operator; in a related but more general meaning, it is the exterior derivative operator in differential geometry
- d, often a variable for the diameter of a circle in geometry
- d(n), Divisor function, the number of positive divisors of an integer n
- in blackboard bold, the unit disk in the complex plane, or the decimal fractions; see Number
- Cohen's d, a statistical measure of effect size.
in blackboard bold, the unit disk in the complex plane, or the decimal fractions; see Biology, chemistry, and medicine
- D, Aspartic acid, in biochemistry
- D (or Asp), an abbreviation for the amino acid aspartate
- D, Diarrhea
- D, deuterium, an isotope of hydrogen
- d, Deuteron, the nucleus of deuterium
- D- prefix, a dextrorotatory compound
- ATC code D Dermatologicals, a section of the Anatomical Therapeutic Chemical Classification System
- Haplogroup D (mtDNA), a human mitochondrial DNA (mtDNA) haplogroup
- Haplogroup D-M174, a Y-chromosomal DNA (Y-DNA) haplogroup
- Vitamin D
Physics
- D, Debye (D), a unit of electrical dipole moment
- D, Dioptre (D), a unit of measurement of the optical power of a lens or curved mirror (also in Medicine)
- D, Diffusion coefficient (D), in molecular physics
- D, Electric displacement field (D)
- D meson, mesons containing charm quarks in particle physics
- d, thickness, diameter, relative density, lattice plane spacing, and degeneracy of vibrational mode, in molecular spectroscopy
- D band (disambiguation)
Solid state physics
- D(E), a function of energy
- Debye–Waller factor (D)
- Diode (D), an electronic component
- Wavenumber , a symbol for the density of states
Time
- Day (d), in metrology
- December (D), in calendars
- Dominical letter D, for a common year starting on Thursday
Transportation
- D (Los Angeles Railway), a line operated by the Los Angeles Railway, US
- D (New York City Subway service), US
- D Line (Los Angeles Metro), US
- Drive, or D, the forward cruising gears in an automatic transmission
- Tesla Model D, a concept all-wheel drive electric sedan
- Line D of the Buenos Aires Subte
, the official West Japan Railway Company service symbol for the JR West Nara Line.- Media–Sharon Hill Line, a SEPTA Metro service, labeled D
- The international vehicle registration code for Germany (Deutschland)
Other uses
- D, a normal modal logic
- D (grade), a below average grade in education
- D, a brassiere cup size
- d, the number of sides of dice in role-playing games
- d, the common US measurement of the penny size (an approximation of length), of a nail
- D-Company, a criminal group
- Daughter (d)
- Defense (sports) (D)
- Democrat (D), a member of the US Democratic Party
- Denarius, a Roman coin
- Died (d.)
- Dominant person (D/), in dominance and submission
- Delta, the military time zone code for UTC+04:00
See also
- The D (disambiguation)
- D♯ (disambiguation)
- D. (disambiguation)
- D- All Things Digital, an annual technology conference
- Dee (disambiguation)
- Filetab-D, a port of the Filetab language based on decision tables
This disambiguation page lists articles associated with the title D.If an internal link led you here, you may wish to change the link to point directly to the intended article. Category: