Ein or EIN may refer to: Science and technology Ein function, in mathematics Endometrial intraepithelial neoplasia, a lesion of the uterine lining Equivalent input noise, of a microphone European Informatics Network, a 1970s computer network
Fictional characters Ein, a character in the anime series Cowboy Bebop Ein, a character in the video game series Dead or Alive Ein, the protagonist of the Game Boy Advance game Riviera: The Promised Land
Other uses Aer Lingus (ICAO code), the flag carrier airline of Ireland Eindhoven Airport (IATA code), in the Netherlands Employer Identification Number, assigned by the US Internal Revenue Service EPODE International Network, a Belgian obesity organization