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A fingerprint in its narrow sense is an impression left by the friction ridges of a human finger. in a wider use of the term, fingerprints are the traces of an impression from the friction ridges of any part of a human or other primate hand. a print from the foot can also leave an impression of friction ridges. a friction ridge is a raised portion of the epidermis on the digits, the palm of the hand or the sole of the foot, consisting of one or more connected ridge units of friction ridge skin.