Could I use it for my password?
You could. . . but at the rate of entering three characters every second, it would take you approximately 84 days and 21 hours to type in your password every time you wanted to log on to where ever you were using that as your password. Just think how frustrating that would be if you dropped a character in the middle of setting it up during entering the second one to match the first entered one, and got to the end, and it says "Passwords don't match, Please try again."