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* D (for ''Deutschland''), the [[international license plate code]] of Germany
* D (for ''Deutschland''), the [[international license plate code]] of Germany
* The [[D River]], in Oregon, USA
* The [[D River]], in Oregon, USA
* A nickname for [[Detroit]].


=== Mathematics ===
=== Mathematics ===

Revision as of 18:38, 30 May 2010

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

Business and economy

Computing

Entertainment and film

Music

Science

Astronomy

Chemistry and biology

  • D, the symbol for aspartic acid in biochemistry
  • D, the symbol of deuterium, an isotope of hydrogen, in chemistry
  • Vitamin D
  • ATC code D Dermatologicals, a section of the Anatomical Therapeutic Chemical Classification System

Genetics

Geography

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 , 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
  • D, the number five hundred in Roman numerals

Physics

  • , the recommended symbol for electric displacement field
  • d, the recommended symbol for: thickness, diameter, relative density (mechanics), lattice plane spacing (solid state physics), and degeneracy of vibrational mode, in molecular spectroscopy
  • d, the symbol of the deuteron in particle physics
  • D, the symbol for debye, a unit of electrical dipole moment
  • D, a standard size dry cell battery in electronics
  • D, the name of mesons containing charm quarks in particle physics
  • D, the recommended symbol for diffusion coefficient in molecular physics
  • In solid state physics:
  • D, the standard abbreviation for an electronic diode, used e.g. in circuit diagrams

Other science

  • D region, part of the ionosphere in earth science
  • D, standing for demand in economics
  • d (deci), the SI prefix meaning one tenth, 10-1
  • d, the symbol for day in metrology

Other uses

Template:Letter disambig