Navigation
  • Home
  • Recent
  • Most Active
  • Popular
  • Blog
  • Credits
  • RSS
  •   Interaction
  • Register
  • Statistics
  •   Help
  • Suggestions
  • Contact Us
  • How to Edit
  • Help



  • [Edit]



    A
      will redirect here due to . See A Sharp for it.
    For the band, see A (band)

    For rating system of CBFC, see A (Rating).


    The letter A is the first letter in the Latin alphabet. Its name in English is a (IPA ).


        A
            History
            Usage
            Codes for computing
            Meanings for A
            See also

    top

    History
    The letter A began as a pictogram of an ox head in Egyptian hieroglyphs or the Proto-semitic alphabet.



    By 1600 BC, the Phoenician alphabet's letter had a linear form that served as the basis for some later forms. Its name must have corresponded closely to the Hebrew aleph. The name is also similar to the Arabic alif.

    When the Ancient Greeks adopted the alphabet, they had no use for the glottal stop that the letter had denoted in Phoenician and other Semitic languages, so they used the sign for the vowel , and changed its name to alpha. In the earliest Greek inscriptions, dating to the 8th century BC, the letter rests upon its side, but in the Greek alphabet of later times it generally resembles the modern capital letter, although 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 what was Italy and left the letter unchanged. The Romans later adopted the Etruscan alphabet to write Latin, and the resulting letter was preserved in the modern Latin alphabet used to write many languages, including English.


    The letter has two minuscule (lower-case) forms. The form used in most current handwriting consists of a circle and vertical stroke (). Most printed material uses a form consisting of a small loop with an arc over it (). Both derive from the majuscule (capital) form. 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.

    top

    Usage
    In English, the letter "A" by itself usually denotes the near-open front unrounded vowel () as in pad, the open back unrounded vowel () as in father, or, in concert with a later orthographic vowel, the diphthong (though the pronunciation varies with the dialect) as in ace and major, due to effects of the Great vowel shift.

    In most other languages that use the Latin alphabet, the letter A denotes either an open back unrounded vowel (), or an open central unrounded vowel (). In the International Phonetic Alphabet, variants of the letter A denote various vowels. In X-SAMPA, capital A denotes the open back unrounded vowel and lowercase a denotes the open front unrounded vowel.

    A is the third-most common letter in English, and the second-most common in Spanish and French. On average, about 3.6% of letters in English tend to be as, while the number is 6.2% in Spanish and 4% in French.

    A also is the English indefinite article, extended to an before a vowel. See a, an.

    A- also is a prefix that serves to negate the morpheme to which it is attached, such as amoral, apolitical, etc.

    top

    Codes for computing

    In Unicode the capital A is codepoint U+0041 and the lowercase a is U+0061.

    In Hex, A is the character used to represent decimal 10, or in binary, 01010

    The ASCII code for capital A is 65 and for lowercase a is 97; or in binary 01000001 and 01100001, correspondingly.

    The EBCDIC code for capital A is 193 and for lowercase a is 129.

    The numeric character references in HTML and XML are "&
      65;" and "&
        97;" for upper and lower case respectively.

    top

    Meanings for A





        A stands for a whitish-blue class of stars in the Morgan-Keenan system
        A stands for a January 1 through 15 discovery, in the provisional designation of a comet (for example, C/1760 A1, the Great Comet of 1760) or asteroid (for example, )
        In the Mac OS, Command-A (for All), and in Windows, Ctrl-A, and selects all the text in the document, or all the pixels of an image.
        A sometimes represents the set of all alphabetic characters within string patterns.
        A is a security division ("Verified Protection") in the TCSEC.
      In education, a grade of A typically represents the highest score that students can achieve. This is sometimes coupled with a plus/minus sign, as in A+ or A-, or a number, as in A1. It is occasionally a grade one level below A
        (pronounced "A Star").
        A refers to the Anode, or filament, component of a vacuum tube.
      In Esperanto, -a is the adjectival/attributive ending; A is commonly an abbreviation meaning English (language).
      In film, A is an Italian film made in 1969.
      In geology it stands for annum (Latin for "year") and is usually used with Mega (Ma) and Giga (Ga) to indicate very long periods of time; see annum.
      In India A is a movie rating, given to those intended to be seen only by adults.
        the letter A is used as a symbol for the universal affirmative proposition in the general form "all x is y." The letters I, E, and O are used respectively for the particular affirmative "some x is y," the universal negative "no x is y," and the particular negative "some x is not y." The use of these letters is generally derived from the vowels of the two Latin verbs affirmo (or AIo), "I assert," and nego, "I deny." The use of the symbols dates from the thirteenth century, though some authorities trace their origin to the Greek logicians.
        A stands for area of geometric figures.
        A, or "side A," refers to the top or first side of a vinyl record.
      In photography, most SLR cameras use A to signify aperture priority mode, where the user sets the aperture and the camera determines the shutter speed.
        The derived property of acceleration (upper-case A for an initial/constant accleration value; lower case a for an instantaneous acceleration variable.)
        the NATO A band ranges below 0.25 GHz.
      In the SI system of units,
        a is the symbol for one year, from the Latin annum
        a is also the deprecated symbol for the are, a unit of surface area equal to 100 square metres.
      In Spanish, A means to or towards.
      In some sports, A is an abbreviation for Assists.
        A is also a term used to signify the standard of grade a certain team is in comparison to another team of the same age. e.g. John is in the A team for soccer.
      In Christian theology, alpha is a metaphor for the beginning/creation of time and matter. It is sometimes translated to A.


    top

    See also












    yo:A
     
    Search more:
     

       
    Source Privacy License Download Contact Us Atlas
    Scientus.org Dictionary (Yet Another Wiki) RC : 1.39
    This article is licensed under the GNU Free Documentation License [copyleft]. It uses material from the Wikipedia article "A". link