What does ILZ stand for?

Illinois Homemade Boats - NCIC boat manufacturer code (NCIC)

Illinois Zinc Co. (SAUO)

Intensive Landuse Zone (SAUO)

International Lead and Zinc (SAUS)

Isham, Lincoln & Beale, Chicago, IL - OCLC symbol (OCLC)

Newport, RI - Location identifier - FAA (FAAL)