What does riu stand for?

Rhode Island - MARC country of publication code - Library of Congress (LCCP)

Andalusia, AL - Location identifier - FAA (FAAL)

RADAR Interface Unit - Military (CAAL)

Radar Interrogation Unit (SAUS)

Radioactive Iodine Uptake - Medicine

Radio Interface Unit (SAUS)

Railroad Insurance Underwriters - Later, RTI (EA)

Refractive Index Unit

Remote Inquiry Unit (SAUS)

Remote Interface Unit - NASA (NASA)

Ring Interface Unit - Telecommunications (OSI)

Riung - Language code (ETLW)

University of Rhode Island, Kingston, RI - OCLC symbol (OCLC)