If you are referring to the letter in the 1 cm circle to the left of the portrait of George Washington, it refers to the Federal Reserve Bank district to which the dollar bill in question was released.
A - Boston
B- New York
C - Philadelphia
D - Cleveland
E - Richmond
F - Atlanta
G - Chicago
H - St Louis
I - Minneapolis
J - Kansas City
K - Dallas
L - San Francisco
Note that each district only distributes the bills; they're actually printed by the Bureau of Engraving and Printing at plants in Washington and Fort Worth.
1 dollar bills
You can exchange 20 dollar bills for 1 dollar bills at a bank or a currency exchange service.
1 Ton of dollar bills is $907,184
4 2dollar bills, 1 five, and 1 one. They do make two dollar bills, but they are rare.
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5 one dollar bills, 4 two dollar bills, 3 three dollar bills, 1 four dollar bill and 1 five dollar bill.
1 million one dollar bills would be about 3,000 feet.
A dollar bill (regardless of denomination) weighs 1 gram. Thus, a pound would contain 454 bills. If the bills in question are $20 bills, the dollar amount would be 20 x 454 = $9,080.00.
Dollar bills are not always worth one dollar, however one dollar bills are worth one dollar for the sake that 1=1, it is a one dollar bill, and can be exchanged for goods and services.
$45,359.2
You can exchange your 1 dollar bills at banks, currency exchange locations, some retail stores, and vending machines.
45% of dollar bills have been in strippers g-strings