digit ratio
ratio of the lengths of different digits or fingers typically measured from the midpoint of bottom crease (where the finger joins the hand) to the tip of the finger
en-GB/ˈdɪd͡ʒɪt ɹeɪʃiːəʊ/
en-US/ˈdɪd͡ʒət ˈɹeɪʃoʊ/
ratio of the lengths of different digits or fingers typically measured from the midpoint of bottom crease (where the finger joins the hand) to the tip of the finger