"Originally a shorthand mark for et, Latin for and, the ampersand has a very traceable and visible evolution. Simply put, the & is not much more than e and t coming together. The ampersand is a marriage of the two letters, which came about through rushed writings and abbreviation starting at its birth around 45AD."
via retinart.net
Typographic Marks Unknown: The Ampersand by Alexander Charchar
Labels:
ampersand,
and,
combination,
evolution,
history,
marker,
shorthand,
typography