A seemingly exhaustive dictionary of ""abbreviations, acronyms, contractions, signs and symbols defined"" including ""the Greek Alphabet, International Civil Aircraft Markings, Numbered Abbreviations, Proofreader's Marks, Punctuation and Diacritical Marks, Radio Alphabet, Roman Numerals and Signs and Symbols"". The letter ""a"", upper case, lower case, or italicized, has some sixty odd meanings in the shorter form whether in literary usage, industrial, scientific, or foreign. All are given which makes this a good professional reference book- for libraries- offices- etc.