Abbreviations, Acronyms, and Initialisms
A - I J - R S - Z
An ABBREVIATION is a shortened form of a word or phrase.
An ACRONYM is a type of abbreviation formed from the initial letter or letters of a phrase or compound-word and pronounced as a single word. Some examples are AWOL, laser, NATO, AIDS, hazmat, UNICEF, and NASA.
An INITIALISM is also a type of abbreviation formed from initial letters, but one that is not pronounced as a word. Some examples are FBI, CIA, USA, FM, and YMCA.
Abbreviations by category:
Titles of Literary Works
Books of the Bible
Legal Terms and Abbreviations
Mathematical Terms and Symbols
Periodic Table of Elements
Weights and Measures