U+00A8 was added to Unicode in version 1.1 (1993). It belongs to the block Latin-1 Supplement in the 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  ̈. 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 regarding line breaks. It has type Other for sentence and Other for word breaks. The Grapheme Cluster Break is Any.

The Wikipedia has the following information about this codepoint:

The diaeresis (/daɪˈɛrɨsɨs/, dy-ERR-ə-səs; plural: diaereses), also spelled diæresis or dieresis and also known as the 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 (/ˈʊmlaʊt/ 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.

The same symbol is also used as a diacritic in other cases, distinct from both diaeresis and umlaut. 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-Escape ¨
Wrong windows-1252 Mojibake ¨
HTML-Escape ¨
HTML-Escape ¨
HTML-Escape ¨
HTML-Escape ¨
digraph ':
LaTeX \textasciidieresis
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

Related Characters

  • ΅
  • ῁
  • ῭


Complete Record

Property Value
Age (age) 1.1
Unicode Name (na) DIAERESIS
Unicode 1 Name (na1) SPACING DIAERESIS
Block (blk) Latin_1_Sup
General Category (gc) Modifier Symbol
Script (sc) Common
Bidirectional Category (bc) Other Neutral
Combining Class (ccc) Not Reordered
Decomposition Type (dt) Compat
Decomposition Mapping (dm)  ̈
Lowercase (Lower)
Simple Lowercase Mapping (slc) ¨
Lowercase Mapping (lc) ¨
Uppercase (Upper)
Simple Uppercase Mapping (suc) ¨
Uppercase Mapping (uc) ¨
Simple Titlecase Mapping (stc) ¨
Titlecase Mapping (tc) ¨
Case Folding (cf) ¨
ASCII Hex Digit (AHex)
Alphabetic (Alpha)
Bidi Control (Bidi_C)
Bidi Mirrored (Bidi_M)
Bidi Paired Bracket (bpb) ¨
Bidi Paired Bracket Type (bpt) None
Cased (Cased)
Composition Exclusion (CE)
Case Ignorable (CI)
Full Composition Exclusion (Comp_Ex)
Changes When Casefolded (CWCF)
Changes When Casemapped (CWCM)
Changes When NFKC Casefolded (CWKCF)
Changes When Lowercased (CWL)
Changes When Titlecased (CWT)
Changes When Uppercased (CWU)
Dash (Dash)
Deprecated (Dep)
Default Ignorable Code Point (DI)
Diacritic (Dia)
East Asian Width (ea) Ambiguous
Extender (Ext)
FC NFKC Closure (FC_NFKC) ¨
Grapheme Cluster Break (GCB) Any
Grapheme Base (Gr_Base)
Grapheme Extend (Gr_Ext)
Hex Digit (Hex)
Hangul Syllable Type (hst) Not Applicable
Hyphen (Hyphen)
ID Continue (IDC)
Ideographic (Ideo)
ID Start (IDS)
IDS Binary Operator (IDSB)
IDS Trinary Operator and (IDST)
Indic Positional Category (InPC) NA
Indic Syllabic Category (InSC) Other
ISO 10646 Comment (isc)
Joining Group (jg) No_Joining_Group
Join Control (Join_C)
Jamo Short Name (JSN)
Joining Type (jt) Non Joining
Line Break (lb) Ambiguous
Logical Order Exception (LOE)
Math (Math)
Noncharacter Code Point (NChar)
NFC Quick Check (NFC_QC) Yes
NFD Quick Check (NFD_QC) Yes
NFKC Casefold (NFKC_CF)  ̈
NFKC Quick Check (NFKC_QC) No
NFKD Quick Check (NFKD_QC) No
Numeric Type (nt) None
Numeric Value (nv) NaN
Other Alphabetic (OAlpha)
Other Default Ignorable Code Point (ODI)
Other Grapheme Extend (OGr_Ext)
Other ID Continue (OIDC)
Other ID Start (OIDS)
Other Lowercase (OLower)
Other Math (OMath)
Other Uppercase (OUpper)
Pattern Syntax (Pat_Syn)
Pattern White Space (Pat_WS)
Quotation Mark (QMark)
Radical (Radical)
Sentence Break (SB) Other
Simple Case Folding (scf) ¨
Script Extension (scx) Common
Soft Dotted (SD)
STerm (STerm)
Terminal Punctuation (Term)
Unified Ideograph (UIdeo)
Variation Selector (VS)
Word Break (WB) Other
White Space (WSpace)
XID Continue (XIDC)
XID Start (XIDS)
Expands On NFC (XO_NFC)
Expands On NFD (XO_NFD)
Expands On NFKC (XO_NFKC)
Expands On NFKD (XO_NFKD)