What is a ulnar loop?

An ulnar loop is a type of fingerprint pattern characterized by ridges that enter from one side of the finger, loop around, and exit on the same side, typically towards the little finger (ulnar side). It is one of the most common fingerprint patterns, along with whorls and arches. In ulnar loops, the core is usually located towards the thumb side, and the pattern is defined by its distinct, looping ridge formations.