Ein or EIN may refer to:

Science and technology

Ein function In mathematics, the exponential integral Ei is a special function on the complex plane. It is defined as one particular definite integral of the ratio between an exponential function and its argument. Definitions For real non-zero values of ...

, in mathematics *

Endometrial intraepithelial neoplasia Endometrial intraepithelial neoplasia (EIN) is a premalignant lesion of the uterine lining that predisposes to endometrioid endometrial adenocarcinoma. It is composed of a collection of abnormal endometrial cells, arising from the glands that li ...

, a lesion of the uterine lining *

Equivalent input noise Equivalent input (also input-referred, referred-to-input (RTI), or input-related), is a method of referring to the signal or noise level at the output of a system as if it were due to an input to the same system. This input's value is called the ...

, of a microphone *

European Informatics Network In telecommunications, packet switching is a method of grouping data into '' packets'' that are transmitted over a digital network. Packets are made of a header and a payload. Data in the header is used by networking hardware to direct the pac ...

, 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 Aer Lingus ( ; an anglicisation of the Irish , meaning "air fleet" compare Welsh 'llynges awyr') is the flag carrier of Ireland. Founded by the Irish Government, it was privatised between 2006 and 2015 and it is now a wholly owned subsidiary ...

(ICAO code), the flag carrier airline of Ireland *

Eindhoven Airport Eindhoven Airport is an airport located west of Eindhoven, Netherlands. In terms of the number of served passengers it is the second largest airport in the Netherlands, with 6.2 million passengers in 2018 (well behind Schiphol, which serves m ...

(IATA code), in the Netherlands * Employer Identification Number, assigned by the US Internal Revenue Service * EPODE International Network, a Belgian obesity organization {{disambiguation, surname