What is the nine tenths of a cent called?

Answer 1

A tenth of a cent, or a mill, which is sometimes notated as ₥, is an abstract unit of currency that doesn't exist, nor has it ever existed, in the United States in the form of real federal currency. The smallest amount unit of currency ever created by the government was the half cent that lasted from the inception of the US treasury in 1794 to 1857, shortly before the Civil War. Although the federal government never made use of the mill, state governments would often use them as tokens for which sales tax could be paid with. I happen to own such a token, a 100 year old coin from Missouri. Today the mill is used only in extremely precise accounting in which cents need to be rounded and at gas station price signs which invariably end with "9/10" of a cent. I got most of my information from Wikipedia at the URL: http://en.wikipedia.org/wiki/Mill_(currency)