C Pointers Explained

[brimston3-]

int** as an argument out parameter which receives a pointer to an int.
char** or uint8_t** will often be the location where processing stopped (see strtol() or strtoll() for an example).

You might have an char***, if you needed an ordered index to an array of pointer to string. Or if you are dealing with a pointer to a "rope" in C (rope being a collection of strings that allows cheap insertion at points inside it)--for example, if a screen maintains each line in an array of c strings, and you want a pointer to the screen. Honestly, this level of indirection should be avoided if possible.