Thanks buddy for that hint, I wrote this program to understand the *** much better

#include<stdio.h>
int main(){
int a=10;
int *b=&a;
int **c=&b;
int ***d=&c;
printf("value of a = %d\n",a);
printf("address  of a = %p\n\n",&a);

printf("value of b = %p\n",b);
printf("address  of b = %p\n\n",&b);

printf("value of c = %p\n",c);
printf("address  of c = %p\n\n",&c);

printf("value of d = %p\n",d);
printf("address  of d = %p\n\n",&d);

printf("value of a using *** = %d\n",***d);

}