| 词条 | Omicron |
| 释义 |
Omicron (uppercase Ο, lowercase ο, literally "small o": όμικρον < ὂ μικρόν - ò mikrón, micron meaning 'small' in contrast to omega) is the 15th letter of the Greek alphabet. In the system of Greek numerals it has a value of 70. This letter is derived from the Phoenician letter ayin . In classical Greek, omicron represented the sound {{IPAblink|o}} in contrast to omega {{IPA|[ɔː]}} and ου {{IPA|[oː]}}. In modern Greek, omicron represents the Modern Greek. --> back rounded vowel {{IPA|/o̞/ }}. Letters that arose from omicron include Roman O and Cyrillic O. The upper-case letter of omicron (O) was originally used in mathematics as a symbol for Big O notation (representing a function's asymptotic growth rate), but has fallen out of favor because omicron is indistinguishable from the Latin letter O and easily confused with the digit zero (0). Omicron is used to designate the fifteenth star in a constellation group, its ordinal placement a function of both magnitude and position.[1][2] Such stars include Omicron Andromedae, Omicron Ceti, and Omicron Persei. Character encodings
|039F|name1=Greek Capital Letter Omicron |03BF|name2=Greek Small Letter Omicron |2C9E|name3=Coptic Capital Letter O |2C9F|name4=Coptic Small Letter O |map2=DOS Greek|map2char1=8E|map2char2=A6 |map3=DOS Greek-2|map3char1=BE|map3char2=E9 |map4=Windows 1253|map4char1=CF|map4char2=EF }}
These characters are used only as mathematical symbols. Stylized Greek text should be encoded using the normal Greek letters, with markup and formatting to indicate text style. {{charmap|1D6B6|name1=Mathematical Bold Capital Omicron |1D6D0|name2=Mathematical Bold Small Omicron |1D6F0|name3=Mathematical Italic Capital Omicron |1D70A|name4=Mathematical Italic Small Omicron |1D72A|name5=Mathematical Bold Italic Capital Omicron |1D744|name6=Mathematical Bold Italic Small Omicron }}{{charmap |1D764|name1=Mathematical Sans-Serif Bold Capital Omicron |1D77E|name2=Mathematical Sans-Serif Bold Small Omicron |1D79E|name3=Mathematical Sans-Serif Bold Italic Capital Omicron |1D7B8|name4=Mathematical Sans-Serif Bold Italic Small Omicron }} References{{Wiktionary|Ο|ο}}1. ^{{cite book |last=Martin|first=Martha Evans |title=The Friendly Stars |url=https://books.google.com/books?id=pxs4AAAAMAAJ&pg=PA135 |accessdate=8 February 2016 |edition=1st |year=1907 |publisher=Harper & Brothers Publishers |location=New York |page=135}} 2. ^{{cite book |last=Wilk |first=Stephen R. |title=Medusa: Solving the Mystery of the Gorgon |url=https://books.google.com/books?id=OnHO4orvz18C&pg=PT201 |accessdate=8 February 2016 |edition=1st |year=2007 |publisher=Oxford University Press |location=New York |isbn=9780199887736 |page=201}} 3. ^{{cite web |url=https://www.unicode.org/charts/PDF/U0370.pdf |title=Greek and Coptic (Range: 0370–03FF) |year=2015 |work=The Unicode Standard, Ver. 8.0 |publisher=Unicode, Inc. |accessdate=8 February 2016}} 4. ^{{cite web |url=https://www.unicode.org/charts/PDF/U1D400.pdf |title=Mathematical Alphanumeric Symbols (Range: 1D400–1D7FF) |year=2015 |work=The Unicode Standard, Ver. 8.0 |publisher=Unicode, Inc. |accessdate=8 February 2016}} 2 : Greek letters|Vowel letters |
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