If you mean the letter inside the round seal, it's an indicator of which of the 12 Federal Reserve districts issued the bill.
If you're referring to another letter, please post a more specific question.
No. George Washington is on the front of the US one Dollar bill.
The treasurer of the U.S's signature is on the front bottom left of the one dollar bill and the Secretary of the treasuery's signature is on the front right on the bottom of the one dollar bill.
George Washington.
William McKinley is found on the observe of the five hundred dollar bill.
A G7 20 dollar bill is made in Chicago.
Thomas Jefferson is the famous figure that is on the front of the U.S $2 dollar bill.
It should be very clear to see, right on the front above the "R" in the word DOLLAR at the bottom of the bill's front.
Benjamin Franklin appears on the front of the current US $100 Dollar bill.
It can have anyone you like, because there's no such thing as a real million dollar bill.
Abraham Lincoln
it is ben Franklin
The serial number and most times the letter on the bill.