Symbol  Format  Data 

∗  Code Point 
U+2217 
TeX 
\ast 

SVG 
In math, the asterisk operator symbol (∗) is used to represent convolution. It signifies the integral of the product of two functions after one is reversed and shifted, which is a key concept in signal and image processing domains. For example, the convolution of functions and is denoted as:
This operation is useful in areas such as digital signal processing, where it is used to filter signals, and in image processing for blurring, sharpening, and edge detection of images.
The asterisk symbol (*) has various uses in math. For computing, it is commonly used to denote the multiplication operation. It also is used to represent the convolution operation.
The interpunct symbol also referred to as the middle dot, dot product symbol, or center dot is used in math to represent the multiplication operator or the dot product operator.