according to different issuance methods, U.S. treasury bonds can be divided into three types: voucher treasury bonds, physical voucher treasury bonds (also known as bearer treasury bonds or treasury bonds) and book-entry treasury bonds.
according to the maturity of bonds, U.S. treasury bonds can be roughly divided into three categories: short-term treasury bills (T-Bills), medium-term treasury notes (T-Notes) and long-term treasury bonds (T-bonds).
besides local investors, U.S. treasury bonds are also available to countries all over the world. In previous years, the average annual issuance of treasury bonds was $5 billion to $6 billion.