What is the significance of x in the address of a variable?

I am trying to print the address of a data member of a class:

#include <iostream>

struct test { int x; };

int main() {
    test t;
    std::cout << &t.x << std::endl;
}

The output is:

0x23fe4c

I don't understand how this points to a memory address. I want to know the meaning of this way of representing addresses.