μ is the symbol for the population mean in statistics.
fyi and related but not necessary for the above answer:
the sample mean is , enunciated by saying "x" bar.
hope this helped.
Citation : http://en.wikipedia.org/wiki/Arithmetic_mean
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In statistics, this is the symbol for the "Variance"
The population mean is the mean value of the entire population. Contrast this with sample mean, which is the mean value of a sample of the population.
It means the sum total.
d bar, d with a bar over it
Since this is regarding statistics I assume you mean lower case sigma (σ) which, in statistics, is the symbol used for standard deviation, and σ2 is known as the variance.