U+7A7A was added to Unicode in version 1.1 (1993). It belongs to the block CJK Unified Ideographs in the Basic Multilingual Plane.

This character is a Other Letter and is mainly used in the Han script. The Unihan Database defines it as empty, hollow, bare, deserted. Its Pīnyīn pronunciation is k.

The glyph is not a composition. It has a Wide East Asian Width. In bidirectional context it acts as Left To Right and is not mirrored. In text U+7A7A behaves as Ideographic regarding line breaks. It has type OLetter for sentence and Other for word breaks. The Grapheme Cluster Break is Any.


System Representation
UTF-8 E7 A9 BA
UTF-16 7A 7A
UTF-32 00 00 7A 7A
URL-Quoted %E7%A9%BA
HTML-Escape 空
Wrong windows-1252 Mojibake 空
Encoding: EUC-KR (hex bytes) CD F6
Encoding: JIS0208 (hex bytes) B6 F5
Pīnyīn k
IRG_GSource G0-3F55
IRG_HSource HB1-
IRG_JSource J0-3675
IRG_KPSource KP0-D0C
IRG_KSource K0-4D76
IRG_TSource T1-4F28
IRG_VSource V1-614
BigFive AAC5
CCCII 214F50
CNS1986 1-4F28
CNS1992 1-4F28
EACC 214F50
GB0 3153
GB1 3153
Jis0 2285
KSC0 4586
MainlandTelegraph 4500
TaiwanTelegraph 4500
Xerox 242:176

Related Characters

  • 🈳


Complete Record

Property Value
Age (age) 1.1
Unicode 1 Name (na1)
Block (blk) CJK
General Category (gc) Other Letter
Script (sc) Han
Bidirectional Category (bc) Left To Right
Combining Class (ccc) Not Reordered
Decomposition Type (dt) None
Decomposition Mapping (dm) 空
Lowercase (Lower)
Simple Lowercase Mapping (slc) 空
Lowercase Mapping (lc) 空
Uppercase (Upper)
Simple Uppercase Mapping (suc) 空
Uppercase Mapping (uc) 空
Simple Titlecase Mapping (stc) 空
Titlecase Mapping (tc) 空
Case Folding (cf) 空
ASCII Hex Digit (AHex)
Alphabetic (Alpha)
Bidi Control (Bidi_C)
Bidi Mirrored (Bidi_M)
Bidi Paired Bracket (bpb) 空
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) Wide
Extender (Ext)
FC NFKC Closure (FC_NFKC) 空
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
kIICore (kIICore) AGT
kIRG_GSource (kIRG_GSource) G0-3F55
kIRG_HSource (kIRG_HSource) HB1-
kIRG_JSource (kIRG_JSource) J0-3675
kIRG_KPSource (kIRG_KPSource) KP0-D0C
kIRG_KSource (kIRG_KSource) K0-4D76
kIRG_TSource (kIRG_TSource) T1-4F28
kIRG_VSource (kIRG_VSource) V1-614
kIRGDaeJaweon (kIRGDaeJaweon) 1289.080
kIRGDaiKanwaZiten (kIRGDaiKanwaZiten) 25415
kIRGHanyuDaZidian (kIRGHanyuDaZidian) 42719.080
kIRGKangXi (kIRGKangXi) 0863.010
kBigFive (kBigFive) AAC5
kCangjie (kCangjie) JCM
kCantonese (kCantonese) hung1 hung3
kCCCII (kCCCII) 214F50
kCihaiT (kCihaiT) 997.601
kCNS1986 (kCNS1986) 1-4F28
kCNS1992 (kCNS1992) 1-4F28
kCowles (kCowles) 1226 1234
kDaeJaweon (kDaeJaweon) 1289.080
Unihan Definition (kDefinition) empty, hollow, bare, deserted
kEACC (kEACC) 214F50
kFenn (kFenn) 10B
kFennIndex (kFennIndex) 279.05 280.02
kFourCornerCode (kFourCornerCode) 3010.1
kFrequency (kFrequency) 2
kGB0 (kGB0) 3153
kGB1 (kGB1) 3153
kGradeLevel (kGradeLevel) 1
kGSR (kGSR) 1172h
kHangul (kHangul)
kHanYu (kHanYu) 42719.080
kHanyuPinlu (kHanyuPinlu) kōng(857) kòng(69)
kHanyuPinyin (kHanyuPinyin) 42719.080:kōng,kǒng,kòng
kHKGlyph (kHKGlyph) 2935
kJapaneseKun (kJapaneseKun) KARA AKU SORA
kJapaneseOn (kJapaneseOn) KUU
kJis0 (kJis0) 2285
kKangXi (kKangXi) 0863.010
kKarlgren (kKarlgren) 469
kKorean (kKorean) KONG
kKPS0 (kKPS0) D0C2
kKSC0 (kKSC0) 4586
kLau (kLau) 1252 1253
kMainlandTelegraph (kMainlandTelegraph) 4500
kMandarin (kMandarin) kōng
kMatthews (kMatthews) 3722
kMeyerWempe (kMeyerWempe) 823 830
kMorohashi (kMorohashi) 25415
kNelson (kNelson) 3317
kPhonetic (kPhonetic) 525 684
Radical Stroke Count (Adobe Japan 1-6) (kRSAdobe_Japan1_6) C+1773+48.3.5 C+1773+116.5.3 V+13735+48.3.5 V+13735+116.5.3
Radical Stroke Count (KangXi) (kRSKangXi) 116.3
Radical Stroke Count (Unicode) (kRSUnicode) 116.3
kSBGY (kSBGY) 027.25 342.34
kTaiwanTelegraph (kTaiwanTelegraph) 4500
kTang (kTang) *kung kùng
Stroke Number (kTotalStrokes) 8
kVietnamese (kVietnamese) không
kXerox (kXerox) 242:176
kXHC1983 (kXHC1983) 0645.110:kōng 0648.080:kòng
Line Break (lb) Ideographic
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) 空
NFKC Quick Check (NFKC_QC) Yes
NFKD Quick Check (NFKD_QC) Yes
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) OLetter
Simple Case Folding (scf) 空
Script Extension (scx) Han
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)