Which item is the u. s. treasury most known for issuing?

U.S. Treasury is most known for issuing money, that is, printing dollars.

Explanation:

The United States Department of the Treasury is a department of the Federal Government of the United States in charge of administering the public treasure of the United States, created by an act by Congress in 1789 to raise economic support for the initial government.

It is responsible for managing the money, and whoever receives or keeps it, according to government instructions. Among its functions is the creation of currency and stamp by the Bureau of Engraving and Printing. It also collects all types of taxes from each state through the Public Treasury.