Fingerprints are divided into 3 types: Whorl, Loop, Arch.

• Whorl (vortex/circle): has 2 intersections
• Loop (hook shape): has 1 intersection
• Arch (arch form): no intersection

To classify and identify fingerprints, the first thing we need to know is

xác định được tâm và giao điểm.

Focus: Core is the center of a vortex or ridge Intersection: Delta is the intersection of the three ridges that make up a point triangle.