#include <stdio.h>

int main(int argc, char* argv[]) {
   char* array[] = { "abc", "def", "ghi", NULL };
   char** pointer = array;

   printf("size of array   = %zu\n", sizeof array);
   printf("size of pointer = %zu\n", sizeof pointer);
   printf("size of argv    = %zu\n", sizeof argv);
}

$ ./a abc def ghi
size of array   = 32
size of pointer = 8
size of argv    = 8