U+51F9 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 concave, hollow, depressed; a pass, valley. Its Pīnyīn pronunciation is āǒ(1).

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+51F9 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 E5 87 B9
UTF-16 51 F9
UTF-32 00 00 51 F9
URL-Quoted %E5%87%B9
HTML-Escape 凹
Wrong windows-1252 Mojibake 凹
Encoding: EUC-KR (hex bytes) E8 EA
Encoding: JIS0208 (hex bytes) B1 FA
Pīnyīn āǒ(1)
IRG_GSource G0-303C
IRG_HSource HB1-
IRG_JSource J0-317A
IRG_KPSource KP0-F9F
IRG_KSource K0-686A
IRG_TSource T1-4577
IRG_VSource V2-8A4
BigFive A557
CCCII 21334C
CNS1986 1-4577
CNS1992 1-4577
EACC 21334C
GB0 1628
GB1 1628
Jis0 1790
KSC0 7274
MainlandTelegraph 0425
TaiwanTelegraph 0425
Xerox 256:076


Complete Record

Property Value
Age (age) 1.1
Unicode Name (na) CJK UNIFIED IDEOGRAPH-51F9
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) 凹
Lowercase (Lower)
Simple Lowercase Mapping (slc) 凹
Lowercase Mapping (lc) 凹
Uppercase (Upper)
Simple Uppercase Mapping (suc) 凹
Uppercase Mapping (uc) 凹
Simple Titlecase Mapping (stc) 凹
Titlecase Mapping (tc) 凹
Case Folding (cf) 凹
ASCII Hex Digit (AHex)
Alphabetic (Alpha)
Bidi Control (Bidi_C)
Bidi Mirrored (Bidi_M)
Bidi Paired Bracket (bpb) 凹
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) 凹
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) G0-303C
kIRG_HSource (kIRG_HSource) HB1-
kIRG_JSource (kIRG_JSource) J0-317A
kIRG_KPSource (kIRG_KPSource) KP0-F9F
kIRG_KSource (kIRG_KSource) K0-686A
kIRG_TSource (kIRG_TSource) T1-4577
kIRG_VSource (kIRG_VSource) V2-8A4
kIRGDaeJaweon (kIRGDaeJaweon) 0301.060
kIRGDaiKanwaZiten (kIRGDaiKanwaZiten) 01810
kIRGHanyuDaZidian (kIRGHanyuDaZidian) 10308.030
kIRGKangXi (kIRGKangXi) 0135.100
kBigFive (kBigFive) A557
kCangjie (kCangjie) SSU
kCantonese (kCantonese) aau1 aau3 lap1 nap1 waa1
kCCCII (kCCCII) 21334C
kCihaiT (kCihaiT) 171.601
kCNS1986 (kCNS1986) 1-4577
kCNS1992 (kCNS1992) 1-4577
kCowles (kCowles) 30 2860
kDaeJaweon (kDaeJaweon) 0301.060
Unihan Definition (kDefinition) concave, hollow, depressed; a pass, valley
kEACC (kEACC) 21334C
kFenn (kFenn) 650G
kFennIndex (kFennIndex) 589.09 617.02
kFourCornerCode (kFourCornerCode) 7777.0
kFrequency (kFrequency) 5
kGB0 (kGB0) 1628
kGB1 (kGB1) 1628
kGradeLevel (kGradeLevel) 4
kHangul (kHangul)
kHanYu (kHanYu) 10308.030
kHanyuPinlu (kHanyuPinlu) āo(31)
kHanyuPinyin (kHanyuPinyin) 10308.030:āo,wā
kHKGlyph (kHKGlyph) 0320
kJapaneseKun (kJapaneseKun) KUBOMU KUBOMI
kJapaneseOn (kJapaneseOn) OU
kJis0 (kJis0) 1790
kKangXi (kKangXi) 0135.100
kKorean (kKorean) YO
kKPS0 (kKPS0) F9FD
kKSC0 (kKSC0) 7274
kLau (kLau) 2272
kMainlandTelegraph (kMainlandTelegraph) 0425
kMandarin (kMandarin) āo
kMatthews (kMatthews) 7268
kMeyerWempe (kMeyerWempe) 23 1968
kMorohashi (kMorohashi) 01810
kNelson (kNelson) 0664
kPhonetic (kPhonetic) 5
Radical Stroke Count (Adobe Japan 1-6) (kRSAdobe_Japan1_6) C+1308+17.2.3
Radical Stroke Count (KangXi) (kRSKangXi) 17.3
Radical Stroke Count (Unicode) (kRSUnicode) 17.3
kSBGY (kSBGY) 544.15
Semantic Variant (kSemanticVariant) 𠕄
kTaiwanTelegraph (kTaiwanTelegraph) 0425
Stroke Number (kTotalStrokes) 5
kXerox (kXerox) 256:076
kXHC1983 (kXHC1983) 0011.030:āo 1176.060:wā
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) 凹
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) 凹
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)