skein

This term primarily describes a physical bundle of yarn, characterized by its coiled and knotted state. It is a technical term in textile arts, distinguishing a loose coil from a "ball" of yarn, which is tightly wound for easier use during knitting.

When used figuratively, the word evokes an image of entanglement and complexity. It is frequently paired with verbs like "unravel" or "untangle" to describe the process of solving a mystery or clarifying a confusing sequence of events. In the context of ornithology, it specifically refers to the visual pattern of birds in flight, emphasizing the linear or V-shaped arrangement rather than just the group itself.