EN can mean:

• Air Dolomiti, IATA airline designator
• A standard established by the European Committee for Standardization
• Engineer
• Estonia (FIPS 10-4 and obsolete NATO country code)
• Evaluation notice
• Exanewton, an SI unit of force.
• Extension node
• EN postal area in London
• Einstürzende Neubauten, a german Industrial music group
• Enrolled Nurse
• In chemistry: Electronegativity

en can mean:

• N, the fourteenth letter of the alphabet
• English language (see List of ISO 639 codes)
• en (Cyrillic) (Н, н), a letter of the Cyrillic alphabet
• en (typography), a unit of measurement in typography defined as half of the width of an em
• a Rōmaji spelling of yen, the Japanese currency
• the number one in Swedish, Norwegian and Danish
• the spiritual leader of a Sumerian temple, the high priest
• En, the Dutch word for "And".
• -en, an alternative plural suffix in hacker slang for words ending in the letter X, such as boxen and VAXen
• a shorthand used in coordination chemistry for the organic ligand ethylene diamine.

E_n is a Lie algebra in mathematics.

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