hackle

In textiles, "hackle" refers to a device used in fiber processing, consisting of a row of sharp, closely spaced needles or wires. It is used to comb or straighten fibers like wool or other natural fibers, aligning them uniformly for spinning or further processing. When fibers are drawn through the hackle, they become aligned and separated into consistent lengths, which improves the quality of the final yarn or fabric. The term can also appear in other fields like biology or engineering, where it describes a similar, pointed or bristle-like feature designed for separating or processing materials.