N400

N400 or N-400 may refer to :

N400 (neuroscience), an event-related potential component elicited by meaningful stimuli (words, pictures, etc.)
N-400 road (Spain), a highway connecting Toledo to Cuenca
Honda N400, a car similar to the Honda N360
Samsung N400, a mobile phone with a 128x128 wallpaper
Form N-400, Application for Naturalization

and also :

a variant of the Aston Martin V8 Vantage (2005) car

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