What type of fingerprint pattern does not have a delta?

A fingerprint pattern that does not have a delta is known as an arch. In fingerprint classification, deltas are specific points where ridges converge or diverge, typically forming triangular shapes. Arches are characterized by raised ridges that enter from one side of the fingerprint, rise to a peak, and exit on the opposite side, creating a smooth wave-like appearance. Since they lack the significant ridge features needed to form a delta, arches are distinctly different from other patterns like loops and whorls, which do contain these features. Loops have one delta, whorls have two or more, and composite patterns can contain a variety of characteristics including those of loops and whorls. Thus, when identifying fingerprint patterns, arches stand out by their absence of deltas and serve as a unique classification category.