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int aa[][]; an array of arrays of ints
int *fp(); a function returning an int pointer
int ***ppp; a pointer to a pointer to an int pointer
int (**ppa)[]; a pointer to a pointer to an array of ints
int (**ppf)(); a pointer to a pointer to a function returning an int
int *(*pap)[]; a pointer to an array of int pointers
int (*paa)[][]; a pointer to an array of arrays of ints
int *(*pfp)(); a pointer to a function returning an int pointer
int **app[]; an array of pointers to int pointers
int (*apa[])[]; an array of pointers to arrays of ints
int (*apf[])(); an array of pointers to functions returning an int
int *aap[][]; an array of arrays of int pointers
int aaa[][][]; an array of arrays of arrays of int
int **fpp(); a function returning a pointer to an int pointer
int (*fpa())[]; a function returning a pointer to an array of ints
int (*fpf())(); a function returning a pointer to a function returning an int

Illegal

int af[](); an array of functions returning an int
int fa()[]; a function returning an array of ints
int ff()(); a function returning a function returning an int
int (*pfa)()[]; a pointer to a function returning an array of ints
int aaf[][](); an array of arrays of functions returning an int
int (*paf)[](); a pointer to a an array of functions returning an int
int (*pff)()(); a pointer to a function returning a function returning an int
int *afp[](); an array of functions returning int pointers
int afa[]()[]; an array of functions returning an array of ints
int aff[]()(); an array of functions returning functions returning an int
int *fap()[]; a function returning an array of int pointers
int faa()[][]; a function returning an array of arrays of ints
int faf()[](); a function returning an array of functions returning an int
int *ffp()(); a function returning a function returning an int pointer

Source: http://ieng9.ucsd.edu/~cs30x/rt_lt.rule.html

Read Declarations online: https://riptutorial.com/c/topic/3729/declarations

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