U+51F9 "凹" CJK Unified Ideograph-# Unicode Character

Unicode Version 18.0

凹
Source: Noto Sans CJK Source: Browser Default

U+51F9 "凹" CJK Unified Ideograph-# is a Chinese character that primarily means "concave" or "indented," representing a surface that curves inward like a hollow or depression, and it is often used in contrast to its counterpart "凸" (convex). This ideograph appears in various East Asian languages including Chinese, Japanese, and Korean, where it is employed in contexts ranging from geometry and descriptions of physical shapes to idiomatic expressions and character components. Its structure visually suggests the concept of a dip or cavity, making it a pictographic representation of a concave form.

凸 Previous U+51F8 CJK Unified Ideograph-# 出 Next U+51FA CJK Unified Ideograph-#

General Properties

Code Point
U+51F9
Version Added
1.1
Name
CJK Unified Ideograph-#
Block
CJK Unified Ideographs
General Category
Other Letter
Canonical Combining Class
Not Reordered
Bidirectional Class
Left To Right

Encodings

HTML Decimal Encoding
凹
HTML Hex Encoding
凹
UTF-8 Encoding
0xE5 0x87 0xB9
UTF-16 Encoding
0x51F9
UTF-32 Encoding
0x000051F9
C/C++/Java Escape
\u51f9

Unicode Properties

NFC Quick Check
Yes
NFD Quick Check
Yes
NFKC Quick Check
Yes
NFKD Quick Check
Yes
Numeric Type
None
Numeric Value
NaN
Line Break
Ideographic
East Asian Width
Wide
Script
Han
Script Extensions
Han
Indic Syllabic Category
Other
ID Start
Yes
XID Start
Yes
ID Continue
Yes
XID Continue
Yes
Alphabetic
Yes
Vertical Orientation
Upright
Grapheme Base
Yes
Grapheme Cluster Break
Other
Word Break
Other
Sentence Break
OLetter
Ideographic
Yes
Unified Ideograph
Yes

Unihan Properties

kBigFive
A557
kCCCII
21334C
kCNS1986
1-4577
kCNS1992
1-4577
kCangjie
SSU
kCantonese
aau3
kCihaiT
171.601
kCowles
30 2860
kDaeJaweon
0301.060
kDefinition
concave, hollow, depressed; a pass, valley
kEACC
21334C
kFanqie
烏洽
kFenn
650G
kFennIndex
589.09 617.02
kFourCornerCode
7777.0
kGB0
1628
kGB1
1628
kGradeLevel
4
kHangul
요:0N
kHanYu
10308.030
kHanyuPinlu
āo(31)
kHanyuPinyin
10308.030:āo,wā
kHKGlyph
0320
kIICore
AGTJHKMP
kIRGHanyuDaZidian
10308.030
kIRG_GSource
G0-303C
kIRG_HSource
HB1-A557
kIRG_JSource
J0-317A
kIRG_KPSource
KP0-F9FD
kIRG_KSource
K0-686A
kIRG_TSource
T1-4577
kIRG_VSource
V2-8A4D
kJapanese
オウ ヨウ くぼむ へこむ ぼこ
kJoyoKanji
2010
kKoreanName
2015
kTGH
2013:260
kJapaneseKun
KUBOMU KUBOMI
kJapaneseOn
OU
kJis0
1790
kKangXi
0135.100
kKorean
YO
kLau
2272
kMainlandTelegraph
0425
kMandarin
āo
kMatthews
7268
kMeyerWempe
23 1968
kMojiJoho
MJ007441
kMorohashi
01810
kNelson
0664
kPhonetic
5
kRSAdobe_Japan1_6
C+1308+17.2.3
kRSUnicode
17.3
kSBGY
544.15
kSemanticVariant
U+20544<kLau
kSMSZD2003Index
55.02
kSMSZD2003Readings
āo粵aau3,nap1 wā粵waa1
kTaiwanTelegraph
0425
kTGHZ2013
004.130:āo
kTotalStrokes
5
kUnihanCore2020
GHJKMPT
kXerox
256:076
kXHC1983
0011.030:āo 1176.060:wā