The word "蛤蚧" is formed by combining two phono-semantic compound characters: "蛤" incorporates the semantic component "虫" (indicating a creature) and the phonetic component "合" (suggesting pronunciation), while "蚧" similarly uses "虫" for meaning and "介" for sound. Together, they specifically refer to a type of gecko, with the dual "虫" components reinforcing its identity as an animal and the phonetic elements guiding the reading of the term.