what does e data type mean in c++ code example

Example: range of long long in c++

Long
Data Type	          Size             (in bytes)	Range
long int	            4	         -2,147,483,648 to 2,147,483,647
unsigned long int	    4	         0 to 4,294,967,295
long long int	        8	         -(2^63) to (2^63)-1
unsigned long long int	8	         0 to 18,446,744,073,709,551,615