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The number π (/paɪ/; spelled out as "pi") is a mathematical constant that is the ratio of a circle's circumference to its diameter, approximately equal to 3.14159. The number π appears in many formulae across mathematics and physics. It is an irrational number, meaning that it cannot be expressed exactly as a ratio of two integers, although ...
Diamond. Typically yellow, brown, or gray to colorless. Less often blue, green, black, translucent white, pink, violet, orange, purple, and red. Diamond is a solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic. Another solid form of carbon known as graphite is the chemically stable form of carbon ...
- Name
- History
- Use in Writing Systems
- Other Uses
- Related Characters
- Other Representations
- External Links
In English, the name of the letter is the long A sound, pronounced /ˈeɪ/. Its name in most other languages matches the letter's pronunciation in open syllables.
The earliest known ancestor of "A" is aleph—the first letter of the Phoenician alphabet, also written 'aleph—where it represented a glottal stop [ʔ], as Phoenician only used consonantal letters. In turn, the ancestor of aleph may have been a pictogram of an ox head in proto-Sinaitic script influenced by Egyptian hieroglyphs, styled as a triangular ...
English
In modern English orthography, the letter ⟨a⟩ represents at least seven different vowel sounds, here represented using the vowels of Received Pronunciation, with effects of ⟨r⟩ ignored and mergers in General Americanmentioned where relevant: 1. the near-open front unrounded vowel /æ/ as in pad 2. the open back unrounded vowel /ɑː/ as in father—merged with /ɒ/ as /ɑ/ in General American—which is closer to its original Latin and Greek sound 3. the open back rounded vowel /ɒ/ (merged with /ɑː/ a...
Other languages
In most languages that use the Latin alphabet, ⟨a⟩ denotes an open unrounded vowel, such as /a/, /ä/, or /ɑ/. An exception is Saanich, in which ⟨a⟩—and the glyph ⟨Á⟩—stands for a close-mid front unrounded vowel /e/.
Other systems
1. In the International Phonetic Alphabet, ⟨a⟩ is used for the open front unrounded vowel, ⟨ä⟩ is used for the open central unrounded vowel, and ⟨ɑ⟩ is used for the open back unrounded vowel. 2. In X-SAMPA, ⟨a⟩ is used for the open front unrounded vowel and ⟨A⟩ is used for the open back unrounded vowel.
When using base-16 notation, ⟨A⟩ is conventionally used as the numeral corresponding to the number 10 in decimal.In algebra, the letter a along with various other letters of the alphabet is often used to denote a variable, with various conventional meanings in different areas of mathematics. In 1637, René Des...In geometry, capital Latin letters are used to denote objects including line segments, lines, and rays A capital A is also typically used as one of the letters to represent an angle in a triangle,..."A" is often used to denote something or someone of a better or more prestigious quality or status: A−, A or A+, the best grade that can be assigned by teachers for students' schoolwork; "A grade"...Related characters in the Latin alphabet
1. ⟨Æ æ⟩: a ligature of ⟨AE⟩originally used in Latin 2. ⟨A⟩ with diacritics: Å å Ǻ ǻ Ḁ ḁ ẚ Ă ă Ặ ặ Ắ ắ Ằ ằ Ẳ ẳ Ẵ ẵ Ȃ ȃ Â â Ậ ậ Ấ ấ Ầ ầ Ẫ ẫ Ẩ ẩ Ả ả Ǎ ǎ Ⱥ ⱥ Ȧ ȧ Ǡ ǡ Ạ ạ Ä ä Ǟ ǟ À à Ȁ ȁ Á á Ā ā Ā̀ ā̀ Ã ã Ą ą Ą́ ą́ Ą̃ ą̃ A̲ a̲ ᶏ 3. Phonetic alphabet symbols related to A—the International Phonetic Alphabet only uses lowercase, but uppercase forms are used in some other writing systems: 3.1. ⟨Ɑ ɑ⟩: Latin alpha, represents an open back unrounded vowelin the IPA 3.2. ⟨ᶐ⟩: Latin small alpha with a ret...
Derived signs, symbols and abbreviations
1. ⟨ª⟩: ordinal indicator 2. ⟨Å⟩: Ångströmsign 3. ⟨∀⟩: turned capital letter A, used in predicate logic to specify universal quantification("for all") 4. ⟨@⟩: At sign 5. ⟨₳⟩: Argentine austral 6. ⟨Ⓐ⟩: anarchy symbol
Ancestor and sibling letters
1. ⟨𐤀⟩: Phoenician aleph, from which the following symbols originally derive 1.1. ⟨Α α⟩: Greek letter alpha, from which the following letters derive 1.1.1. ⟨А а⟩: Cyrillic letter A 1.1.2. ⟨Ⲁ ⲁ⟩: Copticletter alpha 1.1.3. ⟨𐌀⟩: Old Italic A, which is the ancestor of modern Latin A 1.1.3.1. ⟨ᚨ⟩: Runic letter ansuz, which probably derives from old Italic A 1.1.4. ⟨𐌰⟩: Gothicletter aza 2. ⟨Ա ա⟩: Armenian letter ayb
Computing
The Latin letters ⟨A⟩ and ⟨a⟩ have Unicode encodings U+0041 A LATIN CAPITAL LETTER A and U+0061 a LATIN SMALL LETTER A. These are the same code points as were used in ASCII and ISO 8859. There are also precomposed character encodings for ⟨A⟩ and ⟨a⟩ with diacritics, for most of those listed above; the remainder are produced using combining diacritics. Variant forms of the letter have unique code points for specialist use: the alphanumeric symbols set in mathematics and science, Latin alpha in...
Texts on Wikisource:Lana Del Rey. Elizabeth Woolridge Grant (born June 21, 1985), known professionally as Lana Del Rey, is an American singer and songwriter. Her music is noted for its cinematic quality and exploration of tragic romance, glamour, and melancholia, with frequent references to contemporary pop culture and 1950s–1970s Americana. [1]
