olemus biomeetrias
sõrmejälje keskosa ala, mis sisaldab
keskmeid, deltasid ja
liigitamiseks kasutatavaid papillaarkurde
=
in biometrics: the central area of ​​a fingerprint, which includes the centers, deltas, and papillary folds used for classification

piltlikult
http://www.dermatoglyphics.com/sof/images/fig011-012.jpg