Google actually calls it "2-step verification" source: http://support.google.com/accounts/bin/answer.py?hl=en&answer=180744 http://support.google.com/accounts/

Google actually calls it "2-step verification" source: http://support.google.com/accounts/bin/answer.py?hl=en&answer=180744 http://support.google.com/accounts/bin/answer.py?hl=en&a...