What does IY stand for?

Cote d'Ivoire - NCIC country-territory code (NCIC)

Imperial Yeomanry - British

International Petroleum (SAUS)

Ionized Yeast

Yemen Airlines - Airline flight code (ODBW)

Yemen Airways - ICAO designator (AD)

Iraq-Saudi Arabia Neutral Zone - MARC country of publication code - Library of Congress (LCCP)

International Interchangeability (SAUS)

Ion Implantation (SAUS)