Simply generates words with all numbers from 0-9 in the position the field is set at. You can use the count to increase the number of digits to be placed in that location.
Similarly to numbers, words will be generated with each given special character at the given element location.
Only the special characters defined in the Settings tab are used. It is recommended that you either stick to the defaults or use a small number of special characters when enabling permutations.
The default list of special characters provided is a list gathered from observing multiple breaches password databases and matches with the theory that users will most likely use only characters that are easily accessible on standard keyboards.
However, since from region to region and language to language this might vary, you have the ability to set any list of special characters you want to.