Blue Book

Blue Book n.  1. Informal name for one of the three standard
   references on the page-layout and graphics-control language
   {{PostScript}} ("PostScript Language Tutorial and Cookbook",
   Adobe Systems, Addison-Wesley 1985, QA76.73.P67P68, ISBN
   0-201-10179-3); the other three official guides are known as the
   {Green Book}, the {Red Book}, and the {White Book} (sense
   2).  2. Informal name for one of the three standard references on
   Smalltalk "Smalltalk-80 The Language and its
   Implementation", David Robson, Addison-Wesley 1983, QA76.8.S635G64,
   ISBN 0-201-11371-63 (this book also has green and red siblings).
   3. Any of the 1988 standards issued by the CCITT's ninth plenary
   assembly.  These include, among other things, the X.400 email spec
   and the Group 1 through 4 fax standards.  See also {{book
   titles}}.