Noun
place of decimals (plural places of decimals)
(arithmetic, dated, chiefly UK, usually in the plural) A decimal place.
... that, in a few years, all great physical constants will have been approximately estimated, and that the only occupation which will be left to men of science will be to carry these measurements to another place of decimals. James Clerk Maxwell
Many instances might be cited, but these will suffice to justify the statement that "our future discoveries must be looked for in the sixth place of decimals." Albert Abraham Michelson