S
Symbol  Format  Data 

S  Code Point 
U+0053 
TeX 
S 

SVG 
The capital Latin letter S is used in math to represent the partial sum of a series.
The Latin letter s is used in statistics to represent the sample standard deviation.
A series is the sum of the terms of a sequence. It can be finite or infinite, depending on the underlying sequence. In calculus, series are used to approximate functions, study convergence and divergence, and understand the behavior of infinite sums.