The letter A is the first letter in the Latin and Old Italic alphabet. It is also the capital form of the Greek letter alpha as well as the first letter of the Cyrillic alphabet.

Usage
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, respectively.
The EBCDIC code for capital A is 193 and for lowercase a is 129.
The morse code for A is dit dah or a dot and a dash
The numeric character references in HTML and XML are "A" and "a" for upper and lower case respectively.