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Micro (symbol µ) is a unit prefix in the metric system denoting a factor of 10−6 (one millionth). Confirmed in 1960, the prefix comes from the Greek ('), meaning "small". The symbol for the prefix comes from the Greek letter μ (mu). It is the only SI prefix which uses a character not from the Latin alphabet. Examples: * The size of the influenza virus is about 0.8 to 1.2 micrometres.〔http://www.nikon.com/about/feelnikon/universcale/index_f.htm〕 * Typical bacteria are 1 to 10 micrometres in diameter. Eukaryotic cells are typically 10 to 100 micrometres in diameter. 〔Biology by Campbell & Reece tenth edition page 98 Ch. 6 A Tour of the Cell〕 ==Symbol encoding in character sets== For historical reasons, there are two different characters in Unicode, which appear slightly different in some fonts, although most fonts use the same glyph. The micro sign (µ) is encoded in the "Latin-1 Supplement" range identical to ISO/IEC 8859-1 (since 1985), at U+00B5 (Unicode 1.0, 1991). The Greek letter (μ) is encoded in the Greek range at U+03BC. According to The Unicode Consortium, the Greek letter character is preferred,〔(Unicode Technical Report #25 )〕 but implementations must recognize the micro sign as well.Per ISO 2955, the prefix can be represented using the letter u in circumstances in which only the Latin alphabet is available, as in ''um'' for µm, or ''uF'' for µF.〔(ISO 2955 ), Table 2.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Micro-」の詳細全文を読む スポンサード リンク
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