Source: Noto Sans

U+02E9 Modifier Letter Extra-Low Tone Bar

U+02E9 was added in Unicode version 1.1 in 1993. It belongs to the block U+02B0 to U+02FF Spacing Modifier Letters in the U+0000 to U+FFFF Basic Multilingual Plane.

This character is a Modifier Symbol and is commonly used, that is, in no specific script.

The glyph is not a composition. It has no designated width in East Asian texts. In bidirectional text it acts as Other Neutral. When changing direction it is not mirrored. The word that U+02E9 forms with similar adjacent characters prevents a line break inside it.

The Wikipedia has the following information about this codepoint:

Tone letters are letters that represent the tones of a language, most commonly in languages with contour tones.

Representations

System	Representation
Nº	745
UTF-8	CB A9
UTF-16	02 E9
UTF-32	00 00 02 E9
URL-Quoted	%CB%A9
HTML hex reference	˩
Wrong windows-1252 Mojibake	â—ŒË©
Encoding: EUC_JIS_2004 (hex bytes)	AB E4
Encoding: EUC_JISX0213 (hex bytes)	AB E4
Encoding: GB18030 (hex bytes)	81 30 BA 33
Encoding: ISO2022_JP_2004 (hex bytes)	1B 24 28 51 2B 64 1B 28 42
Encoding: ISO2022_JP_3 (hex bytes)	1B 24 28 4F 2B 64 1B 28 42
Encoding: SHIFT_JIS_2004 (hex bytes)	86 84
Encoding: SHIFT_JISX0213 (hex bytes)	86 84
L^AT_EX	\tone{11}
AGL: Latin-5	uni02E9
Adobe Glyph List	tonebarextralowmod

Elsewhere

Complete Record

Property	Value
Age (age)	1.1 (1993)
Unicode Name (na)	MODIFIER LETTER EXTRA-LOW TONE BAR
Unicode 1 Name (na1)	—
Block (blk)	Spacing Modifier Letters
General Category (gc)	Modifier Symbol
Script (sc)	Common
Bidirectional Category (bc)	Other Neutral
Combining Class (ccc)	Not Reordered
Decomposition Type (dt)	none
Decomposition Mapping (dm)	Modifier Letter Extra-Low Tone Bar
Lowercase (Lower)	✘︎
Simple Lowercase Mapping (slc)	Modifier Letter Extra-Low Tone Bar
Lowercase Mapping (lc)	Modifier Letter Extra-Low Tone Bar
Uppercase (Upper)	✘︎
Simple Uppercase Mapping (suc)	Modifier Letter Extra-Low Tone Bar
Uppercase Mapping (uc)	Modifier Letter Extra-Low Tone Bar
Simple Titlecase Mapping (stc)	Modifier Letter Extra-Low Tone Bar
Titlecase Mapping (tc)	Modifier Letter Extra-Low Tone Bar
Case Folding (cf)	Modifier Letter Extra-Low Tone Bar
ASCII Hex Digit (AHex)	✘︎
Alphabetic (Alpha)	✘︎
Bidi Control (Bidi_C)	✘︎
Bidi Mirrored (Bidi_M)	✘︎
Composition Exclusion (CE)	✘︎
Case Ignorable (CI)	✔︎
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)	✘︎
Cased (Cased)	✘︎
Full Composition Exclusion (Comp_Ex)	✘︎
Default Ignorable Code Point (DI)	✘︎
Dash (Dash)	✘︎
Deprecated (Dep)	✘︎
Diacritic (Dia)	✔︎
Emoji Modifier Base (EBase)	✘︎
Emoji Component (EComp)	✘︎
Emoji Modifier (EMod)	✘︎
Emoji Presentation (EPres)	✘︎
Emoji (Emoji)	✘︎
Extender (Ext)	✘︎
Extended Pictographic (ExtPict)	✘︎
FC NFKC Closure (FC_NFKC)	Modifier Letter Extra-Low Tone Bar
Grapheme Cluster Break (GCB)	Any
Grapheme Base (Gr_Base)	✔︎
Grapheme Extend (Gr_Ext)	✘︎
Grapheme Link (Gr_Link)	✘︎
Hex Digit (Hex)	✘︎
Hyphen (Hyphen)	✘︎
ID Continue (IDC)	✘︎
ID Start (IDS)	✘︎
IDS Binary Operator (IDSB)	✘︎
IDS Trinary Operator and (IDST)	✘︎
IDSU (IDSU)	0
ID_Compat_Math_Continue (ID_Compat_Math_Continue)	0
ID_Compat_Math_Start (ID_Compat_Math_Start)	0
Ideographic (Ideo)	✘︎
InCB (InCB)	None
Indic Mantra Category (InMC)	—
Indic Positional Category (InPC)	NA
Indic Syllabic Category (InSC)	Other
Jamo Short Name (JSN)	—
Join Control (Join_C)	✘︎
Logical Order Exception (LOE)	✘︎
Modifier Combining Mark (MCM)	✘︎
Math (Math)	✘︎
Noncharacter Code Point (NChar)	✘︎
NFC Quick Check (NFC_QC)	Yes
NFD Quick Check (NFD_QC)	Yes
NFKC Casefold (NFKC_CF)	Modifier Letter Extra-Low Tone Bar
NFKC Quick Check (NFKC_QC)	Yes
NFKC_SCF (NFKC_SCF)	Modifier Letter Extra-Low Tone Bar
NFKD Quick Check (NFKD_QC)	Yes
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)	✘︎
Prepended Concatenation Mark (PCM)	✘︎
Pattern Syntax (Pat_Syn)	✘︎
Pattern White Space (Pat_WS)	✘︎
Quotation Mark (QMark)	✘︎
Regional Indicator (RI)	✘︎
Radical (Radical)	✘︎
Sentence Break (SB)	Other
Soft Dotted (SD)	✘︎
Sentence Terminal (STerm)	✘︎
Terminal Punctuation (Term)	✘︎
Unified Ideograph (UIdeo)	✘︎
Variation Selector (VS)	✘︎
Word Break (WB)	Alphabetic Letter
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)	✘︎
Bidi Paired Bracket (bpb)	Modifier Letter Extra-Low Tone Bar
Bidi Paired Bracket Type (bpt)	None
East Asian Width (ea)	neutral
Hangul Syllable Type (hst)	Not Applicable
ISO 10646 Comment (isc)	—
Joining Group (jg)	No_Joining_Group
Joining Type (jt)	Non Joining
Line Break (lb)	Alphabetic
Numeric Type (nt)	none
Numeric Value (nv)	not a number
Simple Case Folding (scf)	Modifier Letter Extra-Low Tone Bar
Script Extension (scx)
Vertical Orientation (vo)	R