DuckCorp Dico

Found one definition

1.                 From en.wiktionary.org:
                   
   
   
                   
                     
   [pubs]
   
   ** English
   
   *** Noun
   [?]
   
    1. [en]  [en] .
   **** Usage notes
   This is the customary abbreviation of this term as used in legal citation.
   _See, e.g._, _The Bluebook: A Uniform System of Citation, Nineteenth Edition_
   (2010), "Subdivisions", Table T16, p.  472-73.
   [en]