The alt code for the summation symbol is 228, so you can type the symbol by holding down alt and typing 228 (using the number pad).
(You can also copy and paste it: Σ)
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The Greek symbol for the sum is Σ (sigma). It is used in mathematics to represent the summation of a series of numbers or expressions. The notation typically includes an index that specifies the starting and ending values for the summation. For example, Σ from i=1 to n indicates the sum of a sequence of terms from i=1 to n.
It's not. It depends on the method you use for summation whether summation > integral or integral > summation.
That is the Greek letter Epsilon which indicates summation.
Sum or summation
A summation is a recap of all the highlights of a presentation.