Capital sigma.
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{}, or the Greek letter phi.
pi is a letter of the Greek alphabet and predates its use in mathematics.pi is a letter of the Greek alphabet and predates its use in mathematics.pi is a letter of the Greek alphabet and predates its use in mathematics.pi is a letter of the Greek alphabet and predates its use in mathematics.
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 is the Greek letter phi. This browser will not allow me to show it.
That is the Greek letter Epsilon which indicates summation.