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Iota (letter) : ウィキペディア英語版
Iota

Iota (uppercase Ι, lowercase ι; (ギリシア語:Ιώτα)) is the ninth letter of the Greek alphabet. It was derived from the Phoenician letter Yodh.〔Victor Parker, ''A History of Greece, 1300 to 30 BC'', (John Wiley & Sons, 2014), 67.〕 Letters that arose from this letter include the Latin I and J and the Cyrillic І (І, і), Yi (Ї, ї), Je (Ј, ј), and iotated letters (e.g. Yu (Ю, ю)).

In the system of Greek numerals iota has a value of 10.
Iota represents the sound (:i). In ancient Greek it occurred in both long and short versions, but this distinction was lost in Koine Greek.〔
Iota participated as the second element in falling diphthongs, with both long and short vowels as the first element. Where the first element was long, the iota was lost in pronunciation at an early date, and was written in polytonic orthography as iota subscript, in other words as a very small ι under the main vowel, for instance (unicode:ᾼ ᾳ ῌ ῃ ῼ ῳ). The former diphthongs became digraphs for simple vowels in Koine Greek.〔see Koine Greek phonology
The word is used in a common English phrase, 'not one iota', meaning 'not the slightest amount', in reference to a phrase in the New Testament (Matthew 5:18): "until heaven and earth pass away, not an iota, not a dot, (King James Version: '() one jot or one tittle') will pass from the Law until all is accomplished." () This refers to iota, the smallest letter, or possibly Yodh, י, the smallest letter in the Hebrew alphabet.
The word 'jot' (or ''iot'') derives from iota.
The German, Portuguese and Spanish name for the letter J (Jot / jota) is derived from iota.
==Symbol==

* In some programming languages (e.g. Go, APL, A+) iota (either its lowercase symbol ι or iota, as a keyword) is used to represent an array of consecutive integers. For example, in APL ι4 gives 1 2 3 4.
* The lowercase iota symbol is sometimes used to write the imaginary unit, but more often Roman i or j is used.
* In mathematics, the inclusion map of one space into another is sometimes denoted by the lowercase iota.
* In logic, the lowercase iota denotes the definite descriptor.
* The lowercase iota symbol has Unicode code point U+03B9 and the uppercase U+0399.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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