"Hello" in Finnish, the native tongue of Finland.

Also means "Hello" in Norwegian, the native tongue of Norway.

an abbreviation for Alfons Heiderich from the Fullmetal Alchemist movie

The word or initialism HEI or Hei could mean:

Hei, the main character from Darker than Black.

Hei, abbreviation for Heilongjiang province in the People's Republic of China

HEI, Graduate Institute of International Studies or Institut universitaire de hautes études internationales, in Geneva, Switzerland

HEI, High Explosive Incendiary ammunition

H.E.I., high energy ignition

HEI, Hautes Etudes d'Ingénieur, engineering school located in Lille, France

Heighington railway station, England; National Rail station code HEI.