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I wish to display to people that a number is a total. I have decided to use the greek symbol for sum:

Σ 

Do I prefix or suffix numbers with this symbol?

Given the total is 10.

Σ10 

or

10Σ 
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    THank you all. I would accept @Andre's comment if it were an answer.2012-05-15

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If $S_n$ is some sequence (for $n=a, a+1, a+2, \cdots, b-1, b$), its sum (total), $T$, is: $T=\sum_{n=a}^b S_n$

which is simply another way of saying

$T=S_a+S_{a+1}+\cdots + S_{b-1}+S_{b}$


Note also that $C \sum_{n=a}^b S_n=C(S_a+S_{a+1}+\cdots + S_{b-1}+S_{b})$

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    $S_n$ is a *sequence*; $T$ is (the value of) a *series*.2012-05-15