KEI
- Knowledge Ecology International, is an NGO that deals with issues related to the effects of intellectual property on public health, cyberlaw and e-commerce, and competition policy.
- Knowledge Economic Index, an economic indicator based on the four pilars of the knowledge economy framework
- Key Experience Indicator, an indicator of an end user's experience of a product, service or application
- Keyword Effectiveness Index, a measure of how effective a keyword is for a web site
- Kinetic Energy Interceptor, a planned American missile defense program
- New York Stock Exchange ticker symbol for Keithley Instruments
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