Pi is one of the letters of the Greek alphabet, and it does look something like II, but not exactly. The top line is continuous. TT is much closer than II.
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The similarity in appearance between the symbol pi and the Roman numeral II is entirely coincidental.
I don't know how to represent the symbol here on WikiAnswers, but you can see it here: http://en.wikipedia.org/wiki/Pi
"Pi" is the symbol almost always used to represent the ratioof the circumference of any circle to its diameter.
The symbol for pi (π), is the Greek letter that is the equivalent to the Roman p. It is the Greek letter pi. It is the first letter of the Greek word περίμετρος (perimetros) from which our word perimeter comes.
Mathematician Rudolph Swetchefriz{Added} The symbol is not "for" pi but is pi - one of the letters of the Greek alphabet.