The character 纤 conveys the notion of something fine, slender, or delicate, like a single filament. The character 维 carries the core meaning of a connecting thread, tie, or strand that holds things together. Combined into 纤维, the word is formed conceptually by merging these two tangible ideas: it paints a picture of slender, thread-like strands that are the fundamental, interwoven components of a material, perfectly capturing the essential physical nature of a fiber.