戸籍
こせき · koseki · JLPT N1 · noun
family register
🏠📜 戸 (household) + 籍 (record book) = official book listing each household
籍 has the bamboo radical 竹, since early records were written on bamboo slips. 戸 originally meant a single door, so one household is one door-unit. Together they name the register of household members.