Source: Noto CJK

U+324B Circled Number Forty On Black Square

U+324B was added to Unicode in version 5.2 (2009). It belongs to the block U+3200 to U+32FF Enclosed CJK Letters and Months in the U+0000 to U+FFFF Basic Multilingual Plane.

This character is a Other Number and is commonly used, that is, in no specific script. The codepoint has the Numeric value 40. The character is also known as speed limit 40 km/h.

The glyph is not a composition. It has a Ambiguous East Asian Width. In bidirectional context it acts as Left To Right and is not mirrored. In text U+324B behaves as Ambiguous (Alphabetic or Ideographic) regarding line breaks. It has type Other for sentence and Other for word breaks. The Grapheme Cluster Break is Any.

The Wikipedia has the following information about this codepoint:

40 (forty) is the natural number following 39 and preceding 41.
Though the word is related to "four" (4), the spelling "forty" replaced "fourty" in the course of the 17th century and is now the standard form.

Representations

System	Representation
Nº	12875
UTF-8	E3 89 8B
UTF-16	32 4B
UTF-32	00 00 32 4B
URL-Quoted	%E3%89%8B
HTML hex reference	㉋
Wrong windows-1252 Mojibake	ã‰‹
alias	speed limit 40 km/h

Elsewhere

Complete Record

Property	Value
Age	5.2 (2009)
Unicode Name	CIRCLED NUMBER FORTY ON BLACK SQUARE
Unicode 1 Name	—
Block	Enclosed CJK Letters and Months
General Category	Other Number
Script	Common
Bidirectional Category	Left To Right
Combining Class	Not Reordered
Decomposition Type	None
Decomposition Mapping	Circled Number Forty On Black Square
Lowercase	✘
Simple Lowercase Mapping	Circled Number Forty On Black Square
Lowercase Mapping	Circled Number Forty On Black Square
Uppercase	✘
Simple Uppercase Mapping	Circled Number Forty On Black Square
Uppercase Mapping	Circled Number Forty On Black Square
Simple Titlecase Mapping	Circled Number Forty On Black Square
Titlecase Mapping	Circled Number Forty On Black Square
Case Folding	Circled Number Forty On Black Square
ASCII Hex Digit	✘
Alphabetic	✘
Bidi Control	✘
Bidi Mirrored	✘
Composition Exclusion	✘
Case Ignorable	✘
Changes When Casefolded	✘
Changes When Casemapped	✘
Changes When NFKC Casefolded	✘
Changes When Lowercased	✘
Changes When Titlecased	✘
Changes When Uppercased	✘
Cased	✘
Full Composition Exclusion	✘
Default Ignorable Code Point	✘
Dash	✘
Deprecated	✘
Diacritic	✘
Emoji Modifier Base	✘
Emoji Component	✘
Emoji Modifier	✘
Emoji Presentation	✘
Emoji	✘
Extender	✘
Extended Pictographic	✘
FC NFKC Closure	Circled Number Forty On Black Square
Grapheme Cluster Break	Any
Grapheme Base	✔
Grapheme Extend	✘
Grapheme Link	✘
Hex Digit	✘
Hyphen	✘
ID Continue	✘
ID Start	✘
IDS Binary Operator	✘
IDS Trinary Operator and	✘
Ideographic	✘
Indic Mantra Category	—
Indic Positional Category	NA
Indic Syllabic Category	Other
Jamo Short Name	—
Join Control	✘
Logical Order Exception	✘
Math	✘
Noncharacter Code Point	✘
NFC Quick Check	Yes
NFD Quick Check	Yes
NFKC Casefold	Circled Number Forty On Black Square
NFKC Quick Check	Yes
NFKD Quick Check	Yes
Other Alphabetic	✘
Other Default Ignorable Code Point	✘
Other Grapheme Extend	✘
Other ID Continue	✘
Other ID Start	✘
Other Lowercase	✘
Other Math	✘
Other Uppercase	✘
Prepended Concatenation Mark	✘
Pattern Syntax	✘
Pattern White Space	✘
Quotation Mark	✘
Regional Indicator	✘
Radical	✘
Sentence Break	Other
Soft Dotted	✘
Sentence Terminal	✘
Terminal Punctuation	✘
Unified Ideograph	✘
Variation Selector	✘
Word Break	Other
White Space	✘
XID Continue	✘
XID Start	✘
Expands On NFC	✘
Expands On NFD	✘
Expands On NFKC	✘
Expands On NFKD	✘
Bidi Paired Bracket	Circled Number Forty On Black Square
Bidi Paired Bracket Type	None
East Asian Width	Ambiguous
Hangul Syllable Type	Not Applicable
ISO 10646 Comment	—
Joining Group	No_Joining_Group
Joining Type	Non Joining
Line Break	Ambiguous (Alphabetic or Ideographic)
Numeric Type	Numeric
Numeric Value	40
Simple Case Folding	Circled Number Forty On Black Square
Script Extension
Vertical Orientation	U