A

This article is about the Latin letter. For the similar Greek letter, see Alpha. For the similar Cyrillic letter, see A (Cyrillic). For other uses, see A (disambiguation).

A
A a
Usage
Writing system	Latin script
Type	Alphabetic
Language of origin	Latin language
Sound values	[a] [ɑ] [ɒ] [æ] [ə] [ɛ] [oː] [ɔ] [e] [ʕ] [ʌ] [ɐ] /eɪ/
In Unicode	U+0041, U+0061
Alphabetical position	1
History
Development	Α α 𐌀 A a
Time period	c. 700 BCE – present
Descendants	Æ Ä Â Ɑ Ʌ Ɐ ª Å ₳ @ Ⓐ ⓐ ⒜ 🅰
Sisters	𐌰 А Я Ә Ӑ א ا ܐ ࠀ 𐎀 ℵ አ ء Ա ա અ अ অ
Other
Associated graphs	a(x), ae, eau, au
Writing direction	Left-to-right

A, or a, is the first letter and the first vowel letter of the Latin alphabet, used in the modern English alphabet, and others worldwide. Its name in English is a (pronounced /ˈeɪ/ AY), plural aes.

It is similar in shape to the Ancient Greek letter alpha, from which it derives. The uppercase version consists of the two slanting sides of a triangle, crossed in the middle by a horizontal bar. The lowercase version can be written in two forms: the double-storey ⟨a⟩ and single-storey ⟨ɑ⟩. The latter is commonly used in handwriting and fonts based on it, especially fonts intended to be read by children, and is also found in italic type.

In English, a is the indefinite article, with the alternative form an.

Name

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.

Pronunciation of the name of the letter ⟨a⟩ in European languages. /a/ and /aː/ can differ phonetically between [a], [ä], [æ] and [ɑ] depending on the language.

History

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 head with two horns extended.

When the ancient Greeks adopted the alphabet, they had no use for a letter representing a glottal stop—so they adapted sign to represent the vowel /a/, calling the letter by the similar name alpha. In the earliest Greek inscriptions dating to the 8th century BC following the Greek Dark Ages, the letter rests upon its side. However, in the later Greek alphabet it generally resembles the modern capital form—though many local varieties can be distinguished by the shortening of one leg, or by the angle at which the cross line is set.

The Etruscans brought the Greek alphabet to the Italian Peninsula, and left the form of alpha unchanged. When the Romans adopted the Etruscan alphabet to write Latin, the resulting form used in the Latin script would come to be used to write many other languages, including English.

Egyptian	Proto-Sinaitic	Proto-Canaanite	Phoenician	Western Greek	Etruscan	Latin

Typographic variants

Different glyphs of the lowercase letter ⟨a⟩

Allographs include a double-storey ⟨a⟩ and single-storey ⟨ɑ⟩.

During Roman times, there were many variant forms of the letter A. First was the monumental or lapidary style, which was used when inscribing on stone or other more permanent media. There was also a cursive style used for everyday or utilitarian writing, which was done on more perishable surfaces. Due to the perishable nature of these surfaces, there are not as many examples of this style as there are of the monumental, but there are still many surviving examples of different types of cursive, such as majuscule cursive, minuscule cursive, and semi-cursive minuscule. Variants also existed that were intermediate between the monumental and cursive styles. The known variants include the early semi-uncial, the uncial, and the later semi-uncial.

Blackletter	Uncial
Roman	Italic	Script

At the end of the Roman Empire (5th century AD), several variants of the cursive minuscule developed through Western Europe. Among these were the semi-cursive minuscule of Italy, the Merovingian script in France, the Visigothic script in Spain, and the Insular or Anglo-Irish semi-uncial or Anglo-Saxon majuscule of Great Britain. By the ninth century, the Caroline script, which was very similar to the present-day form, was the principal form used in book-making, before the advent of the printing press. This form was derived through a combining of prior forms.

Road sign in Ireland showing the Irish "Latin alpha" form of ⟨a⟩ in lower and upper case forms

15th-century Italy saw the formation of the two main variants that are known today. These variants, the Italic and Roman forms, were derived from the Caroline Script version. The Italic form ⟨ɑ⟩, also called script a, is often used in handwriting; it consists of a circle with a vertical stroke on its right. In the hands of medieval Irish and English writers, this form gradually developed from a 5th-century form resembling the Greek letter tau ⟨τ⟩. The Roman form ⟨a⟩ is found in most printed material, and consists of a small loop with an arc over it. Both derive from the majuscule form ⟨A⟩. In Greek handwriting, it was common to join the left leg and horizontal stroke into a single loop, as demonstrated by the uncial version shown. Many fonts then made the right leg vertical. In some of these, the serif that began the right leg stroke developed into an arc, resulting in the printed form, while in others it was dropped, resulting in the modern handwritten form. Graphic designers refer to the Italic and Roman forms as single-decker a and double decker a respectively.

Italic type is commonly used to mark emphasis or more generally to distinguish one part of a text from the rest set in Roman type. There are some other cases aside from italic type where script a ⟨ɑ⟩, also called Latin alpha, is used in contrast with Latin ⟨a⟩, such as in the International Phonetic Alphabet.

Use in writing systems

Pronunciation of ⟨a⟩ by language

Orthography	Phonemes
Standard Chinese (Pinyin)	/a/
English	/æ/, /ɑː/, /ɒ/, /ɔː/, /ɛː/, /eɪ/, /ə/
French	/a/, /ɑ/
German	/a/, /aː/
Portuguese	/a/, /ɐ/
Saanich	/e/
Spanish	/a/
Turkish	/a/

English

Further information: Pronunciation of English ⟨a⟩

In English language education, the word apple is consistently associated with the letter A.

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 American mentioned where relevant:

• the near-open front unrounded vowel /æ/ as in pad
• 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
• the open back rounded vowel /ɒ/ (merged with /ɑː/ as /ɑ/ in General American) in was and what
• the open-mid back rounded vowel /ɔː/ in water
• the diphthong /eɪ/ as in ace and major, usually when ⟨a⟩ is followed by one, or occasionally two, consonants and then another vowel letter—this results from Middle English lengthening followed by the Great Vowel Shift
• a schwa /ə/ in many unstressed syllables, as in about, comma, solar

The double ⟨aa⟩ sequence does not occur in native English words, but is found in some words derived from foreign languages such as Aaron and aardvark. However, ⟨a⟩ occurs in many common digraphs, all with their own sound or sounds, particularly ⟨ai⟩, ⟨au⟩, ⟨aw⟩, ⟨ay⟩, ⟨ea⟩ and ⟨oa⟩.

⟨a⟩ is the third-most-commonly used letter in English after ⟨e⟩ and ⟨t⟩, as well as in French; it is the second most common in Spanish, and the most common in Portuguese. ⟨a⟩ represents approximately 8.2% of letters as used in English texts; the figure is around 7.6% in French 11.5% in Spanish, and 14.6% in Portuguese.

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

• 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.
• In X-SAMPA, ⟨a⟩ is used for the open front unrounded vowel and ⟨A⟩ is used for the open back unrounded vowel.

Other uses

Main article: A (disambiguation)

• 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 Descartes "invented the convention of representing unknowns in equations by x, y, and z, and knowns by a, b, and c", and this convention is still often followed, especially in elementary algebra.
• 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, the lowercase a representing the side opposite angle A.
• "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" for clean restaurants; A-list celebrities, etc. Such associations can have a motivating effect, as exposure to the letter A has been found to improve performance, when compared with other letters.
• "A" is used as a prefix on some words, such as asymmetry, to mean "not" or "without" (from Greek).
• In English grammar, a, and its variant an, are forms of the indefinite article used to introduce noun phrases.
• "A" is used to denote size, as in a narrow size shoe, or a small cup size in a brassiere.

Related characters

Related characters in the Latin alphabet

• ⟨Æ æ⟩: a ligature of ⟨AE⟩ originally used in Latin
• ⟨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
• Phonetic alphabet symbols related to A—the International Phonetic Alphabet only uses lowercase, but uppercase forms are used in some other writing systems:
  • ⟨Ɑ ɑ⟩: Latin alpha, represents an open back unrounded vowel in the IPA
  • ⟨ᶐ⟩: Latin small alpha with a retroflex hook
  • ⟨Ɐ ɐ⟩: Turned A, represents a near-open central vowel in the IPA
  • ⟨Λ ʌ⟩: Turned V, represents an open-mid back unrounded vowel in IPA
  • ⟨Ɒ ɒ⟩: Turned alpha or script A, represents an open back rounded vowel in the IPA
  • ⟨ᶛ⟩: Modifier letter small turned alpha
  • ⟨ᴀ⟩: Small capital A, an obsolete or non-standard symbol in the International Phonetic Alphabet used to represent various sounds (mainly open vowels)
  • ⟨^{A a} ᵄ⟩: Modifier letters are used in the Uralic Phonetic Alphabet (UPA), sometimes encoded with Unicode subscripts and superscripts
  • ⟨_a⟩: Subscript small a is used in Indo-European studies
  • ⟨ꬱ⟩: Small letter a reversed-schwa is used in the Teuthonista phonetic transcription system
  • ⟨Ꞻ ꞻ⟩: Glottal A, used in the transliteration of Ugaritic

Derived signs, symbols and abbreviations

• ⟨ª⟩: ordinal indicator
• ⟨Å⟩: Ångström sign
• ⟨∀⟩: turned capital letter A, used in predicate logic to specify universal quantification ("for all")
• ⟨@⟩: At sign
• ⟨₳⟩: Argentine austral
• ⟨Ⓐ⟩: anarchy symbol

Ancestor and sibling letters

• ⟨𐤀⟩: Phoenician aleph, from which the following symbols originally derive
  • ⟨Α α⟩: Greek letter alpha, from which the following letters derive
    • ⟨А а⟩: Cyrillic letter A
    • ⟨Ⲁ ⲁ⟩: Coptic letter alpha
    • ⟨𐌀⟩: Old Italic A, which is the ancestor of modern Latin A
      • ⟨ᚨ⟩: Runic letter ansuz, which probably derives from old Italic A
    • ⟨𐌰⟩: Gothic letter aza
• ⟨Ա ա⟩: Armenian letter ayb

Other representations

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 linguistics, and halfwidth and fullwidth forms for legacy CJK font compatibility. The Cyrillic and Greek homoglyphs of the Latin ⟨A⟩ have separate encodings U+0410 А CYRILLIC CAPITAL LETTER A and U+0391 Α GREEK CAPITAL LETTER ALPHA.

Other

NATO phonetic	Morse code
Alpha

Signal flag	Flag semaphore	American manual alphabet (ASL fingerspelling)	British manual alphabet (BSL fingerspelling)	Braille dots-1 Unified English Braille

References

Bibliography

• "English Letter Frequency". Math Explorer's Club. Cornell University. 2004. Archived from the original on 22 April 2014. Retrieved 28 May 2014.
• "Percentages of Letter Frequencies per Thousand Words". Trinity College. 2006. Archived from the original on 25 January 2007. Retrieved 11 May 2015.
• Ciani, Keith D.; Sheldon, Kennon M. (2010). "A Versus F: The Effects of Implicit Letter Priming on Cognitive Performance". British Journal of Educational Psychology. 80 (1): 99–119. doi:10.1348/000709909X466479. PMID 19622200.
• Diringer, David (2000). "A". In Bayer, Patricia (ed.). Encyclopedia Americana. Vol. I. Danbury, CT: Grolier. ISBN 978-0-717-20133-4.
• Gelb, I. J.; Whiting, R. M. (1998). "A". In Ranson, K. Anne (ed.). Academic American Encyclopedia. Vol. I. Danbury, CT: Grolier. ISBN 978-0-717-22068-7.
• Hall-Quest, Olga Wilbourne (1997). "A". In Johnston, Bernard (ed.). Collier's Encyclopedia. Vol. I. New York: P. F. Collier.
• Hoiberg, Dale H., ed. (2010). "A". Encyclopædia Britannica. Vol. 1. Chicago. ISBN 978-1-593-39837-8.{{cite encyclopedia}}: CS1 maint: location missing publisher (link)
• McCarter, P. Kyle (1974). "The Early Diffusion of the Alphabet". The Biblical Archaeologist. 37 (3): 54–68. JSTOR 3210965. S2CID 126182369.
• Simpson, J. A.; Weiner, E. S. C., eds. (1989). "A". The Oxford English Dictionary. Vol. I (2nd ed.). Oxford University Press. ISBN 978-0-198-61213-1.

External links

• History of the Alphabet
• Texts on Wikisource:
  • "A" in A Dictionary of the English Language by Samuel Johnson
  • "A" . Encyclopædia Britannica. Vol. I (9th ed.). 1878. p. 1.
  • "A". The American Cyclopædia. 1879.
  • "A". Encyclopædia Britannica. Vol. I (11th ed.). 1911. p. 1.
  • "A". The New Student's Reference Work. 1914.
  • "A". Collier's New Encyclopedia. 1921.