To create or decipher legal abbreviations,
use the Cardiff Index to Legal Abbreviations and/or Prince's Bieber Dictionary of Legal Abbreviations, published by William S. Hein & Co.
(there is a regular and a "reversed" edition). Bieber's is available in hard copy and on Lexis (LEXREF;BIELA).
For abbreviations of case reporters, state codes, treaty sets, etc., you can also use the shaded pages at the end of The Bluebook: A Uniform System of Citation and/or the Guide to Foreign and International Legal Citations (Aspen).
For non-legal abbreviations, try the Acronyms, Initialisms & Abbreviations Dictionary, a similar acronym and/or abbreviation dictionary. Several of these dictionaries are on the Internet, including the
Acronym Server. To find others, visit the links on OneLook Dictionaries and the Acronym
You can look up the names of medical journals and their Medline abbreviations using the Journals page on PubMed.
To decipher the extensions at the end of corporate names ("Inc.," "Ltd.," etc.), visit the the "definitions" page posted by CI: Corporate Information.