BND refers to Vanguard Total Bond Market ETF, which is an investment fund that invests in taxable investment-grade corporate, U.S. Treasury, mortgage-backed, and asset-backed securities with short, intermediate, and long maturities. It seeks to track the performance of the Bloomberg U.S. Aggregate Float Adjusted Index, which measures the performance of a wide spectrum of public, investment-grade, taxable, fixed income securities in the United States, all with maturities of more than 1 year.

Apart from the investment fund, BND also refers to the Bundesnachrichtendienst, which is the foreign intelligence service of the Federal Republic of Germany, compiling political, economic, and military foreign intelligence.