D

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Latin alphabet
	Aa	Bb	Cc	Dd
Ee	Ff	Gg	Hh	Ii	Jj
Kk	Ll	Mm	Nn	Oo	Pp
Qq	Rr	Ss	Tt	Uu	Vv
	Ww	Xx	Yy	Zz

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

Table of contents

1 History

2 Alternate representations

2.1 Computing

3 Meanings for D

4 See also

History

The Semitic letter D�let probably developed from the logogram for a fish or a door. In Semitic, Ancient Greek (Modern Greek /�/) and Latin the letter was pronounced /d/, in the Etruscan alphabet the letter was superfluous but still maintained (see letter B). Greek letter: Δ (capital) or δ (small) (Delta).

In Cantonese, the sound /d/ means a little bit, from the ancient use of the character 的 (in the phrase "兀的") in Chinese written language. Since 的 is no longer used in this way, Hong Kong residents invented a new character 啲 (which is not supported in many Chinese systems), or simply write D instead.

Alternate representations

Delta represents the letter D in the NATO phonetic alphabet, except in airports, to avoid confusion with Delta Air Lines, in which case it is Dixie.

In international Morse code the letter D is DahDitDit: - � �

In Braille the letter D is represented as ⠙ (in Unicode), the dot pattern,

XX
.X
..

Computing

In Unicode the capital D is codepoint U+0044 and the lowercase d is U+0064.

The ASCII code for capital D is 68 and for lowercase d is 100; or in binary 01000100 and 01100100, correspondingly.

The EBCDIC code for capital D is 196 and for lowercase d is 132.

The numeric character references in HTML and XML are "D" and "d" for upper and lower case respectively.

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 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 a programming language; see D programming language.
In education, D is a barely passing grade.
In electronics, D is a standard size dry cell battery.
In finance securities, D is the stock 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 differential operator.
- 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 Metric system, d, deci, is the SI prefix meaning one tenth, 10^-1.
In music, D is a note.
In nutrition, D is a vitamin.
In print, D Magazine is a magazine for the city of Dallas, Texas.
In Roman numerals, D denotes 500.

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Categories: Latin alphabet

D