Which of the following is NOT considered a fingerprint pattern?

Deltas are not classified as a fingerprint pattern but rather as features or points of reference within the common fingerprint patterns—arches, loops, and whorls. In fingerprint analysis, patterns are defined shapes or formations that can be visually identified, comprising the unique configurations of ridges on a finger.

Arches, loops, and whorls each represent distinct types of fingerprint patterns characterized by specific arrangements of ridges. Arches are formed by ridges that enter from one side and exit from the other, creating a wave-like appearance. Loops have ridges that enter from one side, curve around, and exit from the same side, forming a U-shape. Whorls appear as a circular or spiral pattern, with ridge lines that encircle a central point.

Deltas, on the other hand, refer to the points where ridge lines converge and can be found within these patterns, particularly in loops and whorls. While they are integral to fingerprint classification, they do not form a pattern on their own but serve as critical markers for identifying the type of fingerprint pattern present. Therefore, recognizing that deltas are features rather than patterns helps clarify the categorization of fingerprint types.