If there is an odd number of elements in the set, then it is the median.
If there is an even number, then there is no middle number.
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That is the Median of the numbers.
The median is the "middle number" of an ordered set of numbers. It is a measure of average (but not a measure that is commonly used, since it has some undesirable qualities).
An ordered set of numbers is a set of numbers in which the order does matter. In ordinary sets {A, B} is the same as {B, A}. However, the ordered set (a, b) is not the same as the ordered set (B, a).
A geometric sequence is an ordered set of numbers such that (after the first number) the ratio between any number and its predecessor is a constant.
I believe a ordered set of operations is called a sequence