Source: Noto CJK

U+31FF Katakana Letter Small Ro

U+31FF was added in Unicode version 3.2 in 2002. It belongs to the block U+31F0 to U+31FF Katakana Phonetic Extensions 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 not a composition. Its East Asian Width is wide. 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+31FF prohibits line breaks before its position. There are some exceptions, though.

The Wikipedia has the following information about this codepoint:

ろ, in hiragana, or ロ in katakana, (romanised as ro) is one of the Japanese kana, each of which represents one mora. The hiragana is written in one stroke, katakana in three. Both represent [ɾo] and both originate from the Chinese character 呂. The Ainu language uses a small ㇿ to represent a final r sound after an o sound (オㇿ or). The combination of an R-column kana letter with handakuten ゜ – ろ゚ in hiragana and ロ゚ in katakana – was introduced to represent [lo] in the early 20th century.

Representations

System	Representation
Nº	12799
UTF-8	E3 87 BF
UTF-16	31 FF
UTF-32	00 00 31 FF
URL-Quoted	%E3%87%BF
HTML hex reference	ㇿ
Wrong windows-1252 Mojibake	ã‡¿

Elsewhere

Complete Record

Property	Value
Age (age)	3.2 (2002)
Unicode Name (na)	KATAKANA LETTER SMALL RO
Unicode 1 Name (na1)	—
Block (blk)	Katakana Phonetic Extensions
General Category (gc)	Other Letter
Script (sc)	Katakana
Bidirectional Category (bc)	Left To Right
Combining Class (ccc)	Not Reordered
Decomposition Type (dt)	none
Decomposition Mapping (dm)	Katakana Letter Small Ro
Lowercase (Lower)	✘
Simple Lowercase Mapping (slc)	Katakana Letter Small Ro
Lowercase Mapping (lc)	Katakana Letter Small Ro
Uppercase (Upper)	✘
Simple Uppercase Mapping (suc)	Katakana Letter Small Ro
Uppercase Mapping (uc)	Katakana Letter Small Ro
Simple Titlecase Mapping (stc)	Katakana Letter Small Ro
Titlecase Mapping (tc)	Katakana Letter Small Ro
Case Folding (cf)	Katakana Letter Small Ro
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)	Katakana Letter Small Ro
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 Small Ro
NFKC Quick Check (NFKC_QC)	Yes
NFKC_SCF (NFKC_SCF)	Katakana Letter Small Ro
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 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)	Katakana Letter Small Ro
Bidi Paired Bracket Type (bpt)	None
East Asian Width (ea)	wide
Hangul Syllable Type (hst)	Not Applicable
ISO 10646 Comment (isc)	—
Joining Group (jg)	No_Joining_Group
Joining Type (jt)	Non Joining
Line Break (lb)	Conditional Japanese Starter
Numeric Type (nt)	none
Numeric Value (nv)	not a number
Simple Case Folding (scf)	Katakana Letter Small Ro
Script Extension (scx)
Vertical Orientation (vo)	Tu