What is plain whorl pattern?

A plain whorl pattern is a type of fingerprint pattern characterized by one or more ridges that make a complete circuit, resembling a circular or spiral shape. This pattern typically has two deltas and is formed when the ridges flow in a circular manner. It is one of the four main fingerprint patterns, along with loops, arches, and composite patterns, and is commonly found in various individuals. The plain whorl is often used in forensic science for identification purposes.