What does HWI stand for?

Hansestadt Wismar - German license plate city code

Harbor West Sales Inc., Traverse City, MI - Manufacturer code for watercraft hull identification number (USCG)

Hardware Interpreter

Hardware Wholesalers, Inc.

Hawaiian - Language code (ETLW)

Hawk Inlet, AK - Location identifier - FAA (FAAL)

Hawkwatch International (EA)

Hazardous Waste Inspectorate (HEAS)

Head Width Index

Helical Washer Institute - Defunct (EA)

High-Water Interval

Horsehair Worms in Illinois (SAUO)

Howard Winters, Incorporated (SAUO)