Cephalic index

Not to be confused with encephalization.

The cephalic index or cranial index is a number obtained by taking the maximum width (biparietal diameter or BPD, side to side) of the head of an organism, multiplying it by 100 and then dividing it by their maximum length (occipitofrontal diameter or OFD, front to back). It is used to categorize dog and cat breeds. In humans, it serves diagnostic purposes for some disorders. It has also been used in the modelling of human migrations to categorize remains.

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