First of all, I have to pay some money to take it, so I tried to get information about this exam.
I just passed Zend Certification exam for PHP 5.3 . It means I have paid Zend, first of all.
They gave me a printed paper (phisical paper) with instruction on what I can do.
It says I can use Zend Certified Engineer icon found in http://www.zend.com/en/services/certification/zce-logo on my CV and site. This is the one that apply to me: