Someone should tell that to everyone who ever used a ½¢ coin in the US. Also, US law explicitly states (31 USC §5101) that the unit of 1/1000th of a dollar is a mill.
Go to a bank and ask for a $500 or $1000 note too. They won’t give you one as they aren’t in circulation anymore, but most (all?) will let you deposit it for face value.
