Duane Dibbley is right; the & is a fancy e-t ligature. In fact you will often see the word "etc." written as "&c" in old books.
The Take Our Word For It newsletter #10 at http://www.takeourword.com/Issue010.html says that the symbol "was invented in 63 BC by {a Roman named} Marcus Tirus" as a shorthand for "et." Learning Kingdom and About.com have the guy's name as "Tiro" but the same date.
Example:
$really-long-to-run-command &
ode to &
the ampersand per se is to say and for those who can't type an a or an n and for those with a cramp in their hand or a band from a land where an & ain't an and but an och or a ja or an et or an und.
Am"per*sand (#), n. [A corruption of and, per se and, i. e., & by itself makes and.]
A word used to describe the character &.
Halliwell.
© Webster 1913.
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