Evangelista Torricelli: Difference between revisions

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:''Not to be confused with [[Ő]], O with double acute.''
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{| align="right" cellpadding="4" style="border: 1px solid #aaaaaa; margin: 0 0 10px 10px; padding: 10px; font-size: 36pt; line-height: 36pt; text-align: center;"
| Õ
| õ
|}
 
'''"Õ"''', or '''"õ"''' is a composition of the [[Latin alphabet|Latin]] letter [[O]] with the [[diacritic]] mark [[tilde]].
 
The [[HTML entity]] is ''&amp;Otilde;'' for Õ and ''&amp;otilde;'' for õ.
 
==Estonian==
In [[Estonian language|Estonian]], ''Õ'' is the 24th letter of the [[Estonian alphabet|alphabet]] (between [[V]] and [[Ä]]), representing the [[close-mid back unrounded vowel]] sound {{IPA|[ɤ]}}. The vowel had previously been marked with [[Ö]], but in the early 19th century, [[Otto Wilhelm Masing]] adopted the letter ''Õ'', ending the confusion between several homographs and clearly showing how to pronounce a word.
 
In informal writing, e.g., emails, instant messaging and when using foreign keyboard layouts where the letter ''Õ'' is not available, some Estonians use the characters [[O]] or [[6 (number)|6]] to approximate this letter.
 
In most dialects of the islands of [[Saaremaa]] and [[Hiiumaa]], ''Õ'' is pronounced the same as ''Ö''.
 
==Portuguese==
In the [[Portuguese language]], the symbol ''Õ'' stands for a [[nasal vowel|nasal]] [[close-mid back rounded vowel]], also written {{IPA|[õ]}} in IPA. It is not considered an independent letter of the [[portuguese alphabet|alphabet]].
 
==Vietnamese==
In the [[Vietnamese language]], the symbol Õ stands for the sound {{IPA|[ɔ]}} with [[creaky voice]] (rising tone with a glottal break followed by a continuation of the rising tone). Vietnamese also has derived letters '''Ỗ'''/'''ỗ''' and '''Ỡ'''/'''ỡ'''.
 
==Võro==
In the [[Võro language]], this letter is the 25th letter of the alphabet, pronounced as in Estonian.<ref>[http://www.omniglot.com/writing/voro.htm Omniglot]</ref>
 
==Mathematical use==
The symbol, pronounced [[Big oh notation#Extensions to the Bachmann–Landau notations|soft-O]], is used as a variant of [[big O notation]] that ignores logarithmic factors. Thus, <math>f(n)=\tilde{O}(g(n))</math> is shorthand for <math>f(n) = O(g(n) \log^kg(n))</math> for some ''k''.
 
==Encoding problems==
Due to [[character encoding]] confusion, the letters can be seen on many incorrectly coded [[Hungarian language|Hungarian]] web pages, representing [[Ő|'''Ő'''/'''ő''']] (letter O with [[double acute accent]]). This can happen due to said characters sharing a [[code point]] in the [[ISO 8859-1]] and [[ISO 8859-2|8859-2]] character sets, as well as the [[Windows-1252]] and [[Windows-1250]] character sets, and the web site designer forgetting to set the correct [[code page]]. '''Õ''' is not part of the Hungarian alphabet. The usage of [[Unicode]] avoids this type of problems.
 
==References==
{{Reflist}}
 
==See also==
*[[Ã]]
*[[Tilde]]
 
{{Latin alphabet}}
 
{{DEFAULTSORT:O-Tilde}}
[[Category:Specific letter-diacritic combinations]]
[[Category:Vowel letters]]

Latest revision as of 06:06, 3 December 2014

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