铆钉

铆钉	mǎo dīng	rivet
铆	mǎo	to fasten with a rivet; to rivet / to hammer in a rivet / (coll.) to concentrate one's strength
钉	dīng	nail / to follow closely / to keep at sb (to do sth) / variant of 盯
钉	dìng	to join things together by fixing them in place at one or more points / to nail / to pin / to staple / to sew on