The word "铆钉" is formed by combining two phono-semantic characters: "铆" uses the metal radical "钅" for semantic meaning and "卯" for phonetic sound, indicating riveting; "钉" similarly uses "钅" for metal and "丁" for sound, meaning nail. Together, they create a compound word where both characters contribute to the meaning of a metal rivet through their shared semantic radical and individual phonetic components.