You need to show the orbital.
The geometry of the orbital tells what kind of orbital it is. For example, speherical is s, and the dumbels are p. Other forms are more difficult to describe with words, but they may be d or f.
The fourth-shell orbital means that the principal quantum number,n, is 4.
The angular momentum quantum number, l, may take any integer from 0 to n - 1. So, in this case they can be 0, 1, 2, or 3.
0 corresponds to s orbital
1 corresponds to p orbital
2: corresponds to d orbital
3: corresponds to f orbital.
Now you can tell, which of those angular momentum quantum number, l, corresponds to your 4th-shell orbital.
