U.S. Treasury Bills

U.S. Treasury Bills represent money loaned to the United States government for a short period of time.

The U.S. government issues treasury bills for one month, 3 months, or 6 months. The bonds are bought at a discount. That means you might buy a bond for $9950, but in 6 months the government would pay you back $10,000. The extra $50 represents your interest.

https://accounting.uworld.com/cpa-review/lc/accounting-dictionary/term/us-treasury-bills/