The interpunct symbol also refered to as middle dot, dot product symbol, or center dot is used in mathematics to represent the multiplication operator and the dot product operator. For example, when working with numbers, the interpunct symbol is used in an expression like this:
$3⋅5$
In plain language, this expression means three multiplied by five. On the other hand, if the symbol is placed between two vectors, then it represents the dot product operation.
Symbol  Format  Data 

⋅  Unicode 

$⋅$  TeX 

SVG 