What anatomy is labeled with the arrow in this image? 
Definitions:
Constituency
A body of voters in a specified area who elect a representative to a legislative body.
Significance Level
The probability of rejecting the null hypothesis when it is actually true, often denoted by alpha (α) and used as a threshold in hypothesis testing.
Percentage Points
A unit for the difference of two percentages, reflecting the absolute difference between them.
Variance
A measure of the dispersion of a set of data points around their mean value.
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