Sigma is a Greek letter that appears just like the Latin letter M on its side! That, ∑ In mathematics and statistics sigma, ∑, means that sum of, to add along. The sigma operate in excel, therefore, is add (values)
How to Use sigma Button to do addition in excel
Select the cell to show the result then in Home tab click on the sigma button, on top right end of the ribbon. You will see the image given below:
Now choose the list of data you would like to add. You will see the image shown below.
Now press the Enter key to get the result.