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Expeed is Nikon's marketing term for the collection of sensor and processors used in its cameras. The Expeed version can be used as a layman's guide to what cameras use similar hardware (and thus similar firmware). Care should be taken with Expeed descriptions of different lines (such as Coolpix, Nikon 1) as there may be little resemblance to one another.

Wikipedia has an article named Expeed, which may be of interest.