The indicated sum of a sequence is called a series. Specifically, a series refers to the sum of the terms in a sequence, often written using summation notation (Σ). For example, if you have a sequence of terms $a_1, a_2, a_3, \dots, a_n$, the indicated sum or series would be:

$S = a_1 + a_2 + a_3 + \dots + a_n = \sum_{i=1}^{n} a_i$

There are different types of series, such as:

1. Finite series: The sum of a finite number of terms.
2. Infinite series: The sum of an infinite sequence of terms.
3. Arithmetic series: The sum of the terms in an arithmetic sequence.
4. Geometric series: The sum of the terms in a geometric sequence.

Would you like further details or have any other questions?

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Here are five related questions to deepen your understanding:

1. What is the difference between a sequence and a series?
2. How do you calculate the sum of an arithmetic series?
3. What is the formula for the sum of a finite geometric series?
4. How do you determine if an infinite series converges?
5. What are some examples of real-world applications of series?

Tip: When working with summation notation, always pay attention to the limits of summation (the starting and ending values) to ensure correct calculations.