What does GRJ stand for?

George - South Africa - Airport symbol (OAG)

Gorje - Yugoslavia - Seismograph station code, US Geological Survey - Closed (SEIS)

G.R. International of Miami - NCIC boat manufacturer code (NCIC)

G.R. International of Miami, Miami, FL - Manufacturer code for watercraft hull identification number (USCG)

Southern Grebo - Language code (ETLW)