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Hello!
An ampersand (&), also commonly called an『and sign』, is a logogram representing the conjunction "and". The symbol is a ligature of the letters in 『et』, which is Latin for 『and』. Its origin is apparent in the second example in the image to the right; the first example, now more common, is a later development.
The ampersand often appeared as a letter at the end of the Latin alphabet, as for example in Byrhtferð's list of letters from 1011. It is thought that teaching & as the last letter of the alphabet (... X Y Z and &), a common practice through the 19th century, led to its name, a corruption of the phrase 『and per se and』, meaning 『and [the symbol which] by itself [is] and』. The Scots and Scottish English name for & is epershand, derived from 『et per se and』 with the same meaning.
For more details on the origin of &, please check wikipedia:
http://en.wikipedia.org/wiki/%26
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