What coin is brown?
I have a coin that is brown in color. I'm not sure which coin it is, so I'm asking what coin is typically brown.
What is a serial number on a $2 bill?
Excuse me, could you please elaborate on what exactly a serial number on a $2 bill is? I'm curious to know how it differs from the serial numbers found on other denominations of currency, and what purpose it serves. Is it a unique identifier for each individual bill, or does it have some other significance? I'd appreciate it if you could provide a concise yet informative explanation.