It called Sigma and using it means to sum the numbers between (inclusive)
the top and bottom number. Often one of the number is "n" which is just a
generic variable. Using it is typically called Sigma Notation and is often
used in series calculations.
"Shay" <sah### [at] simcoparts com> wrote in message
news:3cb30962$1@news.povray.org...
> I'm not sure if this is off topic or not, but any help would be
appreciated.
>
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> Thank you,
> -Shay
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