주민등록증이 · 주민등록증을
resident registration card, national ID card
Example
은행에서 계좌를 만들 때 주민등록증이 필요해요.
You need your national ID card to open a bank account.
Word parts
주 live+민 people+등 register+록 record+증 certificate
Literally 'resident registration certificate'.
Good to know
Pronounced [주민등녹쯩]; in conversation people often shorten it to 주민증.