What does JHW stand for?

Jamestown - New York - Airport symbol (OAG)

Jamestown, NY - Location identifier - FAA (FAAL)

J. H. Wheeler Boatwright, Honolulu, HI - Manufacturer code for watercraft hull identification number (USCG)

Johns Hopkins University, Welch Medical Library, Baltimore, MD - OCLC symbol (OCLC)