What does HAH stand for?

Hahon - Language code (ETLW)

Hanscomb Hardware - NCIC firearms make code (NCIC)

Hardwicke & Hansen Ocean Inc., Warren, MI - Manufacturer code for watercraft hull identification number (USCG)

Healthcare Association of Hawaii (SRA)

Jacksonville, NC - Location identifier - FAA (FAAL)

Moroni - Comoro Islands Hahaia Airport - Airport symbol (OAG)