Taxpayer Identification Number
https://www.irs.gov/individuals/international-taxpayers/taxpayer-identification-numbers-tin
India: Permanent Account Number (PAN).
Indonesia: Nomor Pokok Wajib Pajak (NPWP).
Japan: Individual Number (nicknamed "My Number").
Korea: Business Registration Number must be used in order to claim a U.S. treaty benefit. Due to local regulation, Google cannot accept any other foreign personal identification (such as Korean resident registration number).
Russia: Taxpayer Personal Identification Number known as INN.
United Kingdom: Unique Taxpayer Reference (UTR), National Insurance Number (NINO).