E40

E40 may refer to:

  • Nimzo-Indian Defense, Encyclopaedia of Chess Openings code
  • European route E40, a road extending from France to Kazakhstan
  • E-40 (born 1967), American rapper
  • GE E40, a locomotive
  • E40, the name for the fuel blend of 40% ethanol and 60% gasoline
  • E40 screw, a type of Edison screw
  • HMS E40, a 1916 British E class submarine
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