STNK is an Indonesian acronym for "Surat Tanda Nomor Kendaraan," which translates to "Vehicle Registration Certificate." There are different synonyms for this word that make it easier for Indonesians to understand it better. One of which is "BPKB" or the "Buku Pemilik Kendaraan Bermotor," which means "Motor Vehicle Ownership Book." This synonym is also useful when referencing other documents related to vehicle ownership. Another synonym for STNK is "Surat Kendaraan," which roughly translates to "Vehicle Document." This term is often used interchangeably with STNK in everyday conversations. Understanding these synonyms can help Indonesians communicate more effectively when discussing vehicle ownership and registration.