We all know what currency/money is and can easily recognize it. But what about people who can't? What do they have to do?
Many countries have their currency in different sizes depending on the denomination, but in the United States, only the coins are different. Otherwise, the paper bills are all the same size. Frankly, the idea of having different colors or sizes for US dollars didn't exist. Plus, it was cheaper to print them all in the same color and paper. Nowadays, it is expected for them to be the same color and size because it's stayed this way.
Countries such as India, Australia, and Malaysia, have a distinct length for each denomination. Not only are they different sizes, but a simple, money identifier card can be used.

Tactile marks along the tool can help identify which bill is which when lined up to the card. Money identifier tools are also very useful. The user has to insert the money into one of the devices, and then the device will provide information about the bill through speech, or a combination of beeps or vibrations.

Some governments tried a more direct approach. In Canada, money is produced in such a way that there are braille dots to indicate the value of the bill.

A very simple way to identify the denomination of bills can be through folding. Particular bills can be folded in particular ways to identify which is which. To be honest, I don't find this very efficient. Yes, folding may help but it also may be a hassle to fold a bill every single time in a very specific/particular way each time you get one.

Under the U.S. Currency program, U.S. citizens who are blind or visually impaired can obtain a currency reader device at no cost. The story behind this is quite interesting. You see, the BEP ( Bureau of Engraving and Printing) was directed to file a status report every six months on their project to provide meaningful access to the United States currency for blind and other visually impaired people. In May 2010 the Department of Treasury and the BEP issued a notice in the Federal Register to inform the public of the features BEP was proposing to the Secretary of Treasury. This included raised tactile features, large, high numerals, and a supplementary currency reader program.
https://www.banknoteworld.com/blog/the-dimensions-of-money-why-do-banknotes-come-in-different-sizes/
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