Information
Complex passwords contain one character from each of the following classes: English uppercase letters, English lowercase letters, Westernized Arabic numerals, and non-alphanumeric characters.
Ensure that an Alphabetic character is part of the password policy on the computer
Rationale:
The more complex a password the more resistant it will be against persons seeking unauthorized access to a system.
Solution
Perform the following to implement the prescribed state for all pwpolicy controls
1. Run the following command in Terminal:
pwpolicy -setaccountpolicies
Examples in pwpolicy man page