The Letter A
A presentation by Mr O'Meara
The First Letter
In the English and Roman alphabets
Associated with high value
The A-Team
Vowel
A is one of five letters that represents a vowel sound.
Note: There are more than a dozen vowel sounds in Australian English
A word
A is both a letter and a word.
As a word, it indicates the indefinite article.
a teacher
vs. the teacher
Evolution
a glottal stop rather than a vowel or a consonant. 
Egyptian hieroglyph for "ox"
Proto-Semitic ox's head
Phoenician
aleph. 1600 BC
Greek letter alpha. Turned on its side sometimes after 800 BC
Etruscan A
Roman A
Blackletter A
Circa 1150 - 1500
Modern A
A student
A-quality work
A-grade material
AAA rating

But not all alphabets
In English, it's name is pronounced /eI/,
using the International Phonetic Alpahbet

In English, the letter "A" by itself usually denotes the near-open front unrounded vowel (/æ/) as in pad or the open back unrounded vowel (/a:/) as in father. 

The plural is aes or, sometimes, a's

A is the third-most-commonly used letter in English. 
On average, about 8.2% of letters in English tend to be As. 
A is the second-most-commonly used letter in Spanish, 6.2%, and French, 4%