Ever wonder what FISA, NSA, or AFL-CIO stand for? Sure, you know they're acronyms, but each letter's supposed to mean something, right? Acronym Finder can help you figure out what acronyms mean. It's sort of like an online dictionary, but instead of typing in words and getting definitions, you type in a series of letters and get a series of words.

Of course, knowing that AFL-CIO stands for American Federation of Labor-Congress of Industrial Organizations doesn't necessarily help you figure out exactly what the organization does.

And like any good internet tool, you don't have to use Acronym Finder for its intended purpose. You can type in your initials and see what organizations or technical terms share a set of letters with you. There are more than 4million acronyms and abbreviations in the database.

[via MakeUseOf]