= R =
rainbow series n.
Any of several series of technical
manuals distinguished by cover color. The original rainbow series
was the NCSC security manuals (see Orange Book, crayola books); the term has also been commonly applied to the PostScript
reference set (see Red Book, Green Book, Blue Book,
White Book). Which books are meant by "`the' rainbow
series" unqualified is thus dependent on one's local technical
--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.