Type or paste a DOI name into the chemistry contexts 1 preliminary pdf box. Further documentation is available here.
This article is about the SI prefix. Look up micro- in Wiktionary, the free dictionary. It is the only SI prefix which uses a character not from the Latin alphabet. Also the letter u instead of µ is allowed by one of the ISO documents.
Typical bacteria are 1 to 10 micrometres in diameter. Eukaryotic cells are typically 10 to 100 micrometres in diameter. Prefixes adopted before 1960 already existed before SI. 1873 was the introduction of the CGS system.