What does EXI stand for?

Excursion Inlet - Alaska - Airport symbol (OAG)

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

Exten Inc., Buffalo, NY - Manufacturer code for watercraft hull identification number (USCG)

Whirlpool Corp., Technical Information Center, Benton Harbor, MI - OCLC symbol (OCLC)