D

The letter D is the fourth letter of the Latin alphabet.

Meanings for D

• In the atmosphere of Earth, the D layer is part of the ionosphere.
• In biochemistry, D is the symbol for aspartic acid.
• 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 chemistry, D is the symbol of deuterium, an isotope of hydrogen.
• In computing, D is the name of various programming languages, most notably the D programming language by Walter Bright.
• In driving a motor vehicle, D (drive) designates the forward cruising gears in an automatic transmission.
• In economics, D is stands for demand.
• In education, D is a barely passing grade.
• In electronics, D is a standard size dry cell battery.
• In finance, D is the New York Stock Exchange ticker symbol for Dominion Resources Inc. VA
• In geometry, d is often a variable for the diameter of a circle.
• In international licence plate codes, D stands for Germany.
• 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.
• In the SI system, d, deci, is the SI prefix meaning one tenth, 10^-1.
• 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 music, D is a note.
• In nutrition, D is a vitamin.
• In particle physics, d is the symbol of the deuteron.
• In physics:
• d is the recommended symbol for: thickness, diameter, relative density (mechanics), lattice plane spacing (solid state physics), and degeneracy of vibrational mode (molecular sectroscopy).
• D is the recommended symbol for: diffusion coefficient (molecular physics), and Debye-Waller factor (solid state physics).
• D is the recommended symbol for electric displacement (electricity and magnetism).
• In print, D Magazine is a magazine for the city of Dallas, Texas.
• In Roman numerals, D denotes the number 500 (there are also separate Unicode characters for this number, 0x216E "?" and 0x217E "?").
• In sports, D is often used as an abbreviation for defence.
• In American politics, D is often used as an abbreviation for democrat.