Source: Noto CJK

U+FF91 Halfwidth Katakana Letter Mu

U+FF91 was added in Unicode version 1.1 in 1993. It belongs to the block U+FF00 to U+FFEF Halfwidth and Fullwidth Forms in the U+0000 to U+FFFF Basic Multilingual Plane.

This character is a Other Letter and is mainly used in the Katakana script.

The glyph is a narrow version of the glyph Katakana Letter Mu. Accordingly, its width in East Asian Text is halfwidth. In bidirectional text it is written from left to right. When changing direction it is not mirrored. This katakana joins with other adjacent katakana to form a word. U+FF91 offers a line break opportunity at its position, except in some numeric contexts.

The Wikipedia has the following information about this codepoint:

む, in hiragana, or ム in katakana, is one of the Japanese kana, which each represent one mora. The hiragana is written with three strokes, while the katakana is written with two. Both represent [mɯ].
In older Japanese texts until the spelling reforms of 1900, む was also used to transcribe the nasalised [ɴ]. Since the reforms, it is replaced in such positions with ん.
In the Ainu language, ム can be written as small ㇺ, which represents a final m sound. This, along with other extended katakana, was developed by Japanese linguists to represent Ainu sounds that do not exist in standard Japanese katakana.

Representations

System	Representation
Nº	65425
UTF-8	EF BE 91
UTF-16	FF 91
UTF-32	00 00 FF 91
URL-Quoted	%EF%BE%91
HTML hex reference	ﾑ
Wrong windows-1252 Mojibake	ï¾‘
Adobe Glyph List	mukatakanahalfwidth

Elsewhere

Complete Record

Property	Value
Age (age)	1.1 (1993)
Unicode Name (na)	HALFWIDTH KATAKANA LETTER MU
Unicode 1 Name (na1)	—
Block (blk)	Halfwidth and Fullwidth Forms
General Category (gc)	Other Letter
Script (sc)	Katakana
Bidirectional Category (bc)	Left To Right
Combining Class (ccc)	Not Reordered
Decomposition Type (dt)	narrow
Decomposition Mapping (dm)	Katakana Letter Mu
Lowercase (Lower)	✘
Simple Lowercase Mapping (slc)	Halfwidth Katakana Letter Mu
Lowercase Mapping (lc)	Halfwidth Katakana Letter Mu
Uppercase (Upper)	✘
Simple Uppercase Mapping (suc)	Halfwidth Katakana Letter Mu
Uppercase Mapping (uc)	Halfwidth Katakana Letter Mu
Simple Titlecase Mapping (stc)	Halfwidth Katakana Letter Mu
Titlecase Mapping (tc)	Halfwidth Katakana Letter Mu
Case Folding (cf)	Halfwidth Katakana Letter Mu
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)	Halfwidth Katakana Letter Mu
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)	✘
Math (Math)	✘
Noncharacter Code Point (NChar)	✘
NFC Quick Check (NFC_QC)	Yes
NFD Quick Check (NFD_QC)	Yes
NFKC Casefold (NFKC_CF)	Katakana Letter Mu
NFKC Quick Check (NFKC_QC)	No
NFKC_SCF (NFKC_SCF)	Katakana Letter Mu
NFKD Quick Check (NFKD_QC)	No
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 Letter
Soft Dotted (SD)	✘
Sentence Terminal (STerm)	✘
Terminal Punctuation (Term)	✘
Unified Ideograph (UIdeo)	✘
Variation Selector (VS)	✘
Word Break (WB)	Katakana
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)	Halfwidth Katakana Letter Mu
Bidi Paired Bracket Type (bpt)	None
East Asian Width (ea)	halfwidth
Hangul Syllable Type (hst)	Not Applicable
ISO 10646 Comment (isc)	—
Joining Group (jg)	No_Joining_Group
Joining Type (jt)	Non Joining
Line Break (lb)	Ideographic
Numeric Type (nt)	none
Numeric Value (nv)	not a number
Simple Case Folding (scf)	Halfwidth Katakana Letter Mu
Script Extension (scx)
Vertical Orientation (vo)	R