Translators score is a value indicating your rating in our translation system. It's calculated basing on the number of your suggestions, submissions, approvals and rejections. Top contributors across all languages are listed on our welcome page, along with the links to their profiles:
How to View Your Score
Score is displayed for you in a toolbar next to your name, and also are visible to everyone from your public profile page:
From the same public profile page you can tweet your score and ranking in your language. See public profile page for more information.