Why darby brief known as pelican brief?

The "Pelican Brief" refers to a legal thriller novel written by John Grisham, published in 1992. The story revolves around a law student, Darby Shaw, who writes a legal brief speculating on the motives behind the murders of two Supreme Court justices. Her brief, dubbed the "Pelican Brief," attracts dangerous attention, leading to a gripping tale of conspiracy and danger. The novel was later adapted into a film starring Julia Roberts and Denzel Washington.