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# U+1D7D8Mathematical Double-Struck Digit Zero

U+1D7D8 was added in Unicode version 3.1 in 2001. It belongs to the block U+1D400 to U+1D7FF Mathematical Alphanumeric Symbols in the U+10000 to U+1FFFF Supplementary Multilingual Plane.

This character is a Decimal Number and is commonly used, that is, in no specific script. The codepoint has the decimal valueΒ 0.

The glyph is a font version of the glyph Digit Zero. It has no designated width in East Asian texts. In bidirectional text it is written as European number from left to right. When changing direction it is not mirrored. This number joins with other adjacent letters and numbers to form a word. U+1D7D8 forms a number with similar characters, which prevents a line break inside it. The glyph can be confused with one other glyph.

0 (zero) is a number representing an empty quantity. Adding 0 to any number leaves that number unchanged. In mathematical terminology, 0 is the additive identity of the integers, rational numbers, real numbers, and complex numbers, as well as other algebraic structures. Multiplying any number by 0 has the result 0, and consequently, division by zero has no meaning in arithmetic.

As a numerical digit, 0 plays a crucial role in decimal notation: it indicates that the power of ten corresponding to the place containing a 0 does not contribute to the total. For example, "205" in decimal means two hundreds, no tens, and five ones. The same principle applies in place-value notations that uses a base other than ten, such as binary and hexadecimal. The modern use of 0 in this manner derives from Indian mathematics that was transmitted to Europe via medieval Islamic mathematicians and popularized by Fibonacci. It was independently used by the Maya.

Common names for the number 0 in English include zero, nought, naught (), and nil. In contexts where at least one adjacent digit distinguishes it from the letter O, the number is sometimes pronounced as oh or o (). Informal or slang terms for 0 include zilch and zip. Historically, ought, aught (), and cipher have also been used.

## Representations

System Representation
NΒΊ 120792
UTF-8 F0 9D 9F 98
UTF-16 D8 35 DF D8
UTF-32 00 01 D7 D8
URL-Quoted %F0%9D%9F%98
HTML hex reference &#x1D7D8;
Wrong windows-1252 Mojibake Γ°ΒΕΈΛ
LATEX \mathbb{0}

## Complete Record

Property Value
Age (age) 3.1 (2001)
Unicode Name (na) MATHEMATICAL DOUBLE-STRUCK DIGIT ZERO
Unicode 1 Name (na1) β
Block (blk) Mathematical Alphanumeric Symbols
General Category (gc) Decimal Number
Script (sc) Common
Bidirectional Category (bc) European Number
Combining Class (ccc) Not Reordered
Decomposition Type (dt) font
Decomposition Mapping (dm) Digit Zero
Lowercase (Lower) β
Simple Lowercase Mapping (slc) Mathematical Double-Struck Digit Zero
Lowercase Mapping (lc) Mathematical Double-Struck Digit Zero
Uppercase (Upper) β
Simple Uppercase Mapping (suc) Mathematical Double-Struck Digit Zero
Uppercase Mapping (uc) Mathematical Double-Struck Digit Zero
Simple Titlecase Mapping (stc) Mathematical Double-Struck Digit Zero
Titlecase Mapping (tc) Mathematical Double-Struck Digit Zero
Case Folding (cf) Mathematical Double-Struck Digit Zero
ASCII Hex Digit (AHex) β
Alphabetic (Alpha) β
Bidi Control (Bidi_C) β
Bidi Mirrored (Bidi_M) β
Composition Exclusion (CE) β
Case Ignorable (CI) β
Changes When Casefolded (CWCF) β
Changes When Casemapped (CWCM) β
Changes When NFKC Casefolded (CWKCF) β
Changes When Lowercased (CWL) β
Changes When Titlecased (CWT) β
Changes When Uppercased (CWU) β
Cased (Cased) β
Full Composition Exclusion (Comp_Ex) β
Default Ignorable Code Point (DI) β
Dash (Dash) β
Deprecated (Dep) β
Diacritic (Dia) β
Emoji Modifier Base (EBase) β
Emoji Component (EComp) β
Emoji Modifier (EMod) β
Emoji Presentation (EPres) β
Emoji (Emoji) β
Extender (Ext) β
Extended Pictographic (ExtPict) β
FC NFKC Closure (FC_NFKC) Mathematical Double-Struck Digit Zero
Grapheme Cluster Break (GCB) Any
Grapheme Base (Gr_Base) β
Grapheme Extend (Gr_Ext) β
Hex Digit (Hex) β
Hyphen (Hyphen) β
ID Continue (IDC) β
ID Start (IDS) β
IDS Binary Operator (IDSB) β
IDS Trinary Operator and (IDST) β
IDSU (IDSU) 0
ID_Compat_Math_Continue (ID_Compat_Math_Continue) 0
ID_Compat_Math_Start (ID_Compat_Math_Start) 0
Ideographic (Ideo) β
InCB (InCB) None
Indic Mantra Category (InMC) β
Indic Positional Category (InPC) NA
Indic Syllabic Category (InSC) Other
Jamo Short Name (JSN) β
Join Control (Join_C) β
Logical Order Exception (LOE) β
Math (Math) β
Noncharacter Code Point (NChar) β
NFC Quick Check (NFC_QC) Yes
NFD Quick Check (NFD_QC) Yes
NFKC Casefold (NFKC_CF) Digit Zero
NFKC Quick Check (NFKC_QC) No
NFKC_SCF (NFKC_SCF) Digit Zero
NFKD Quick Check (NFKD_QC) No
Other Alphabetic (OAlpha) β
Other Default Ignorable Code Point (ODI) β
Other Grapheme Extend (OGr_Ext) β
Other ID Continue (OIDC) β
Other ID Start (OIDS) β
Other Lowercase (OLower) β
Other Math (OMath) β
Other Uppercase (OUpper) β
Prepended Concatenation Mark (PCM) β
Pattern Syntax (Pat_Syn) β
Pattern White Space (Pat_WS) β
Quotation Mark (QMark) β
Regional Indicator (RI) β
Sentence Break (SB) Numeric
Soft Dotted (SD) β
Sentence Terminal (STerm) β
Terminal Punctuation (Term) β
Unified Ideograph (UIdeo) β
Variation Selector (VS) β
Word Break (WB) Numeric
White Space (WSpace) β
XID Continue (XIDC) β
XID Start (XIDS) β
Expands On NFC (XO_NFC) β
Expands On NFD (XO_NFD) β
Expands On NFKC (XO_NFKC) β
Expands On NFKD (XO_NFKD) β
Bidi Paired Bracket (bpb) Mathematical Double-Struck Digit Zero
Bidi Paired Bracket Type (bpt) None
East Asian Width (ea) neutral
Hangul Syllable Type (hst) Not Applicable
ISO 10646 Comment (isc) β
Joining Group (jg) No_Joining_Group
Joining Type (jt) Non Joining
Line Break (lb) Numeric
Numeric Type (nt) decimal
Numeric Value (nv) 0
Simple Case Folding (scf) Mathematical Double-Struck Digit Zero
Script Extension (scx)
Vertical Orientation (vo) R