Question

What does $\mathrm{S}$ mean in math?

Answer 1

Meaning of $\mathbf{S}$ in mathematics:

The alphabet $S$has different meanings in mathematics.

1. Usually, the alphabet $S$ represents the summation value. In arithmetic, geometric or harmonic series, the letter $S$ represents the sum of $n$number of terms.
2. In statistics, $S$ denotes the standard deviation of a sample.
   In regression, $S$denotes the standard error of the regression which is the average distance that the observed values fall from the regression line.
3. In Herons' formula to find the area of a triangle, $S$ represents the semi-perimeter of the triangle, i.e., $S=\frac{a+b+c}{2}$,
4. The SI unit of time is seconds and is denoted by $s$.

Hence, the meaning of $\mathbf{S}$ is explained.