Acronyms are a kind of abbreviations. Acronym word comes from Greek, meaning heads of names.

An acronym is a word formed from each of the first letters of a phrase. Occasionally, for special reasons, the second letter of a word is used. Not all acronyms are pronounceable.

NATO = North Atlantic Treaty Organization
Laser = Light Amplification by Stimulated Emission of Radiation
Radar = Radio Detection and Ranging
FAQ = Frequently Asked Question
BBC = British Broadcasting Corporation
Modem = Modulator/Demodulator

You can find abbreviations and acronyms with this site

Internet Acronyms Dictionary located at has an easy to browse database of acronyms sorted by first letter.

Another site dedicated to acronyms is