Micro may refer to any of the following:
1. Micro (µ) is a scientific prefix used in the metric system that stands for .000001 (10-6, or one-millionth).
What is smaller than a micro?
With SI prefixes, nano is smaller than micro.
What is larger than a micro?
With SI prefixes, milli is larger than micro.
What is micro's non-decimal equivalent?
A mega (M) is the prefix used for 106.
2. Micro is a generic term, prefix, or adjective that describes an object that is relatively small compared to other, similar objects.