毫微

(prefix) nano-

surname Wei / ancient Chinese state near present day Chongqing / Taiwan pr. [Wei2]

tiny / miniature / slightly / profound / abtruse / to decline / one millionth part of / micro- / Taiwan pr. [wei2]

hair / drawing brush / (in the) least / one thousandth / currency unit, 0.1 yuan

millimicron or one-millionth of a millimeter