Definition: Nostro and vostro accounts
External debt - IMF
A vostro (your) account is another bank’s account with a reporting bank, while a nostro (our) account is a reporting bank’s account with another bank.
International Monetary Fund (IMF), "External Debt Statistics: Guide for Compilers and Users; Appendix I. Specific Financial Instruments and Transactions: Classifications", Washington D.C., 2003