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Tréma

¨
Diaeresis
Diacritics in Latin & Greek
accent
acute( ´ )
double acute( ˝ )
grave( ` )
double grave(  ̏ )
breve( ˘ )
inverted breve(  ̑ )
caron, háček( ˇ )
cedilla( ¸ )
circumflex( ˆ )
diaeresis, umlaut( ¨ )
dot( · )
hook, hook above(   ̡   ̢  ̉ )
horn(  ̛ )
iota subscript(  ͅ  )
macron( ¯ )
ogonek, nosinė( ˛ )
perispomene(  ͂  )
ring( ˚, ˳ )
rough breathing( )
smooth breathing( ᾿ )
Marks sometimes used as diacritics
apostrophe( )
bar( ◌̸ )
colon( : )
comma( , )
hyphen( ˗ )
tilde( ~ )
Diacritical marks in other scripts
Arabic diacritics
Early Cyrillic diacritics
kamora(  ҄ )
pokrytie(  ҇ )
titlo(  ҃ )
Gurmukhī diacritics
Hebrew diacritics
Indic diacritics
anusvara( )
chandrabindu( )
nukta( )
virama( )
chandrakkala( )
IPA diacritics
Japanese diacritics
dakuten( )
handakuten( )
Khmer diacritics
Syriac diacritics
Thai diacritics
Related
Dotted circle
Punctuation marks
Logic symbols

The diaeresis (UK /dˈɪrss/, US /dˈɛrss/ dy-ERR-i-sis; plural: diaereses), also spelled diæresis or dieresis and also known as the tréma (also: trema) or the umlaut, is a diacritical mark that consists of two dots ( ¨ ) placed over a letter, usually a vowel. When that letter is an i or a j, the diacritic replaces the tittle: ï.

The diaeresis and the umlaut are diacritics marking two distinct phonological phenomena. The diaeresis represents the phenomenon also known as diaeresis or hiatus in which a vowel letter is not pronounced as part of a digraph or diphthong. The umlaut (/ˈʊmlt/ UUM-lowt), in contrast, indicates a sound shift. These two diacritics originated separately; the diaeresis is considerably older. Nevertheless, in modern computer systems using Unicode, the umlaut and diaeresis diacritics are identical, e.g. U+00E4 ä LATIN SMALL LETTER A WITH DIAERESIS (HTML ä · ä) represents both a-umlaut and a-diaeresis.


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