The character 睾丸 (gāowán, meaning "testicles") is formed through a direct visual-conceptual metaphor. The first component, 睾, acts as a semantic unit depicting a covered or net-like enclosure (originally from 罒, a net radical, over 幸, suggesting something essential or bound), while the second component, 丸, means "small round pellet". Thus, the compound visually represents "round pellets within a protective sack", creating a straightforward pictographic-logographic representation of the anatomy.