The cap symbol is used in mathematics as the set intersection operator. It also is used in probability to represent the occurence of two events. Typically, it is used in an expression like this:
In plain language, this means the intersection of the sets and . Shown below are various formats for the cap symbol.
Symbol  Format  Data 

∩  Unicode 

TeX 


SVG 
The set intersection operator returns the shared elements between two sets. The operator is denoted using the cap symbol.  set theory
The probability of two events is given by the probability of the first event occurring given that the second event has occured multiplied by the probility of the second event occuring.
The conditional probility formula shows how to calculate the probability of a event B, given that another event A has already occured.