What does DUJ stand for?

Dhuwal - Language code (ETLW)

Digital Urology Journal (SAUS)

Du Bois - Pennsylvania - Airport symbol (OAG)

Duffy & Duffy Fiberglass Boats, Inc., Brooklin, ME - Manufacturer code for watercraft hull identification number (USCG)

E. I. Du Pont de Nemours & Co., Jackson Laboratory, Wilmington, DE - OCLC symbol (OCLC)

Juris Utriusque Doctor - Doctor of Both Laws; i.e., Canon and Civil Law