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The Stirling Number of a second kind is denoted by \(S\left(n,k\right)\)or \(\left(n,k\right)\)  counts the number of ways to partition a set of \(n\) elements into \(k\) non-empty  sets. 

For example, \(S\left(3,2\right)\)\(=3\), because there are three ways to partition three objects, namely \(a,b\) and \(c\) into three two  groups. \(\left(a\right)\left(bc\right),\left(b\right)\left(ac\right)\) and \(\left(c\right)\left(ab\right).\)