Term for the mean of the minimum and maximum of a set of real numbers

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I've been programming something for a few days now, and there's a concept I find myself lacking a name for that I feel like I should know offhand.

Is there a term (generally accepted or otherwise) for the halfway point between the minimum and maximum value of a set of reals?

In other words, a term for the centroid of the smallest line encompassing all members of the set?

For explicitness's sake, I mean the term for the value given by $$\frac{\max(S) + \min(S)}{2}$$

where $S\subseteq \mathbb{R}$.

I suppose higher-dimensional analogues exist, like if you found the centroid of the smallest-possible $n$-ball all points lived in— I would be happy with either a term for this general phenomenon or a narrower term for just real numbers/1D points.