Ein

Ein is German for a and an and one (masculine/neuter). Ein can also stand for:

• Ein, a character in the anime series Cowboy Bebop
• Ein, see Hayate (Dead or Alive), a character in the video game Dead or Alive
• Ein, the protagonist of the Game Boy Advance game Riviera: The Promised Land
• Ein (Hebrew, אין) means Nothing, Null. See also Ein Sof.

EIN can stand for:

• Endometrial intraepithelial neoplasia, a precancerous condition in women
• Employer Identification Number, a number assigned by the United States Internal Revenue Service to all employers
• Eindhoven Airport, an airport with IATA code EIN
• Aer Lingus, an airline whose ICAO code is EIN
• Equivalent Input Noise, a measure of noise in a microphone preamp, see Equivalent input

https://en.wikipedia.org/wiki/Ein