Home U+0080 to U+00FF Latin-1 Supplement
Glyph for U+00A8
Source: Noto Sans

U+00A8 Diaeresis

U+00A8 was added to Unicode in version 1.1 (1993). It belongs to the block U+0080 to U+00FF Latin-1 Supplement in the U+0000 to U+FFFF Basic Multilingual Plane.

This character is a Modifier Symbol and is commonly used, that is, in no specific script.

The glyph is a Compat composition of the glyphs Glyph for U+0020 Space, Glyph for U+0308 Combining Diaeresis. It has a Ambiguous East Asian Width. In bidirectional context it acts as Other Neutral and is not mirrored. In text U+00A8 behaves as Ambiguous (Alphabetic or Ideographic) regarding line breaks. It has type Other for sentence and Other for word breaks. The Grapheme Cluster Break is Any.

The CLDR project labels this character “diaeresis” for use in screen reading software. It assigns additional tags, e.g. for search in emoji pickers: diaeresis, tréma, umlaut.

The Wikipedia has the following information about this codepoint:

The diaeresis ( dy-ERR-ə-sis, -⁠EER-; also known as the trema) and the umlaut () are two different diacritical marks that (in modern usage) look alike. They both consist 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. In computer systems, both forms have the same code point (binary code). Their appearance in print or on screen may vary between typefaces but rarely within the same typeface.

The "diaeresis" and the "umlaut" are diacritics marking two distinct phonological phenomena.

  • The "diaeresis" diacritic is used to mark the separation of two distinct vowels in adjacent syllables when an instance of diaeresis (or hiatus) occurs, so as to distinguish from a digraph or diphthong.
  • The "umlaut" diacritic, in contrast, indicates a sound shift phenomenon – also known as umlaut – in which a back vowel becomes a front vowel.

Neither of these phenomena occur in English, except in loanwords (like naïve) or for stylistic reasons (as in the Brontë family or Mötley Crüe).

These two diacritics have different origins, the diaeresis being considerably older. Nevertheless, in modern computer systems using Unicode, the umlaut and diaeresis diacritics are encoded identically. For example, U+00E4 ä LATIN SMALL LETTER A WITH DIAERESIS represents both a-umlaut and a-diaeresis.

The same mark, placed above or below the letter, is used in other contexts and for different purposes and meanings. For example, in Albanian, ë represents a schwa.


System Representation
UTF-8 C2 A8
UTF-16 00 A8
UTF-32 00 00 00 A8
URL-Quoted %C2%A8
HTML hex reference ¨
Wrong windows-1252 Mojibake ◌¨
HTML named entity ¨
HTML named entity ¨
HTML named entity ¨
HTML named entity &uml
HTML named entity ¨
Encoding: EUC-KR (hex bytes) A1 A7
Encoding: ISO-8859-2 (hex bytes) A8
Encoding: ISO-8859-3 (hex bytes) A8
Encoding: ISO-8859-4 (hex bytes) A8
Encoding: ISO-8859-7 (hex bytes) A8
Encoding: ISO-8859-8 (hex bytes) A8
Encoding: JIS0208 (hex bytes) A1 AF
Encoding: MACINTOSH (hex bytes) AC
Encoding: WINDOWS-1250 (hex bytes) A8
Encoding: WINDOWS-1252 (hex bytes) A8
Encoding: WINDOWS-1253 (hex bytes) A8
Encoding: WINDOWS-1254 (hex bytes) A8
Encoding: WINDOWS-1255 (hex bytes) A8
Encoding: WINDOWS-1256 (hex bytes) A8
Encoding: WINDOWS-1257 (hex bytes) 8D
Encoding: WINDOWS-1258 (hex bytes) A8
LATEX \textasciidieresis
AGL: Latin-1 dieresis
AGL: Latin-2 dieresis
AGL: Latin-3 dieresis
AGL: Latin-4 dieresis
AGL: Latin-5 dieresis
Adobe Glyph List dieresis
digraph ':

Related Characters


Complete Record

Property Value
Age 1.1 (1993)
Unicode Name DIAERESIS
Block Latin-1 Supplement
General Category Modifier Symbol
Script Common
Bidirectional Category Other Neutral
Combining Class Not Reordered
Decomposition Type Compat
Decomposition Mapping Glyph for U+0020 Space Glyph for U+0308 Combining Diaeresis
Simple Lowercase Mapping Glyph for U+00A8 Diaeresis
Lowercase Mapping Glyph for U+00A8 Diaeresis
Simple Uppercase Mapping Glyph for U+00A8 Diaeresis
Uppercase Mapping Glyph for U+00A8 Diaeresis
Simple Titlecase Mapping Glyph for U+00A8 Diaeresis
Titlecase Mapping Glyph for U+00A8 Diaeresis
Case Folding Glyph for U+00A8 Diaeresis
ASCII Hex Digit
Bidi Control
Bidi Mirrored
Composition Exclusion
Case Ignorable
Changes When Casefolded
Changes When Casemapped
Changes When NFKC Casefolded
Changes When Lowercased
Changes When Titlecased
Changes When Uppercased
Full Composition Exclusion
Default Ignorable Code Point
Emoji Modifier Base
Emoji Component
Emoji Modifier
Emoji Presentation
Extended Pictographic
FC NFKC Closure Glyph for U+00A8 Diaeresis
Grapheme Cluster Break Any
Grapheme Base
Grapheme Extend
Grapheme Link
Hex Digit
ID Continue
ID Start
IDS Binary Operator
IDS Trinary Operator and
Indic Mantra Category
Indic Positional Category NA
Indic Syllabic Category Other
Jamo Short Name
Join Control
Logical Order Exception
Noncharacter Code Point
NFC Quick Check Yes
NFD Quick Check Yes
NFKC Casefold Glyph for U+0020 Space Glyph for U+0308 Combining Diaeresis
NFKC Quick Check No
NFKD Quick Check No
Other Alphabetic
Other Default Ignorable Code Point
Other Grapheme Extend
Other ID Continue
Other ID Start
Other Lowercase
Other Math
Other Uppercase
Prepended Concatenation Mark
Pattern Syntax
Pattern White Space
Quotation Mark
Regional Indicator
Sentence Break Other
Soft Dotted
Sentence Terminal
Terminal Punctuation
Unified Ideograph
Variation Selector
Word Break Other
White Space
XID Continue
XID Start
Expands On NFC
Expands On NFD
Expands On NFKC
Expands On NFKD
Bidi Paired Bracket Glyph for U+00A8 Diaeresis
Bidi Paired Bracket Type None
East Asian Width Ambiguous
Hangul Syllable Type Not Applicable
ISO 10646 Comment
Joining Group No_Joining_Group
Joining Type Non Joining
Line Break Ambiguous (Alphabetic or Ideographic)
Numeric Type None
Numeric Value not a number
Simple Case Folding Glyph for U+00A8 Diaeresis
Script Extension
Vertical Orientation R