What does ARJ stand for?

Acquisition RADAR Jamming

Aerojet de Costa Rica SA - ICAO designator (FAAC)

Arapaso - Language code (ETLW)

Arch Chemicals - NYSE symbol (SPSG)

Arctco - NCIC boat manufacturer code (NCIC)

Arctic Cat Inc., Thief River Falls, MN - Manufacturer code for watercraft hull identification number (USCG)

Aristocrat - NCIC firearms make code (NCIC)

Around - Telegraphy (PCTE)

Austin Rover Japan

Providence, RI - Location identifier - FAA (FAAL)