[SI the next quantifier below micro-; meaning * 10^(-9)] pref. Smaller than micro-, and used in the same rather loose and connotative way. Thus, one has {nanotechnology} (coined by hacker K. Eric Drexler) by analogy with `microtechnology'; and a few machine architectures have a `nanocode' level below `microcode'. Tom Duff at Bell Labs has also pointed out that "Pi seconds is a nanocentury". See also {quantifiers}, pico-, nanoacre, nanobot, nanocomputer, nanofortnight.