"Abbreviations.com is the world's largest and most comprehensive directory and search engine for acronyms, abbreviations and initialisms on the Internet. Abbreviations.com holds hundreds of thousands of entries organized by a large variety of categories from computing and the Web to governmental, medicine and business and it is expanding daily."
Rulers.org lists the leaders of every country in the world dating back to the 1700s in some cases, as well as the leaders of many international and religious organizations.
