What does GIU stand for?

Gary's Custom Aluminum Fabrication, Mulberry, FL - Manufacturer code for watercraft hull identification number (USCG)

Gateway Interface Unit (DGA)

General Importers Union (SAUO)

General Intelligence Unit - US, London

Geoballistic Input Unit

Giulia - NCIC car model code

Government Information Unit (SAUO)

Guidance Integration Unit (MCD)

Guidance Interface Unit (SAUS)

Union Guineene de Transports - Guinea - ICAO designator (FAAC)