Source: Noto CJK

U+339C Square Mm

U+339C was added to Unicode in version 1.1 (1993). It belongs to the block U+3300 to U+33FF CJK Compatibility in the U+0000 to U+FFFF Basic Multilingual Plane.

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

The glyph is a Square composition of the glyphs Latin Small Letter M, Latin Small Letter M. It has a Wide East Asian Width. In bidirectional context it acts as Left To Right and is not mirrored. In text U+339C behaves as 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:

The millimetre (international spelling; SI unit symbol mm) or millimeter (American spelling) is a unit of length in the International System of Units (SI), equal to one thousandth of a metre, which is the SI base unit of length. Therefore, there are one thousand millimetres in a metre. There are ten millimetres in a centimetre.
One millimetre is equal to 1000 micrometres or 1000000 nanometres. Since an inch is officially defined as exactly 25.4 millimetres, a millimetre is equal to exactly 5⁄127 (≈ 0.03937) of an inch.

Representations

System	Representation
Nº	13212
UTF-8	E3 8E 9C
UTF-16	33 9C
UTF-32	00 00 33 9C
URL-Quoted	%E3%8E%9C
HTML hex reference	㎜
Wrong windows-1252 Mojibake	ãŽœ
Encoding: EUC-KR (hex bytes)	A7 AE
Encoding: JIS0208 (hex bytes)	AD D0
Adobe Glyph List	squaremm

Elsewhere

Complete Record

Property	Value
Age	1.1 (1993)
Unicode Name	SQUARE MM
Unicode 1 Name	SQUARED MM
Block	CJK Compatibility
General Category	Other Symbol
Script	Common
Bidirectional Category	Left To Right
Combining Class	Not Reordered
Decomposition Type	Square
Decomposition Mapping	Latin Small Letter M Latin Small Letter M
Lowercase	✘
Simple Lowercase Mapping	Square Mm
Lowercase Mapping	Square Mm
Uppercase	✘
Simple Uppercase Mapping	Square Mm
Uppercase Mapping	Square Mm
Simple Titlecase Mapping	Square Mm
Titlecase Mapping	Square Mm
Case Folding	Square Mm
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	Square Mm
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	Latin Small Letter M Latin Small Letter M
NFKC Quick Check	No
NFKD Quick Check	No
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	Square Mm
Bidi Paired Bracket Type	None
East Asian Width	Wide
Hangul Syllable Type	Not Applicable
ISO 10646 Comment	—
Joining Group	No_Joining_Group
Joining Type	Non Joining
Line Break	Ideographic
Numeric Type	None
Numeric Value	not a number
Simple Case Folding	Square Mm
Script Extension
Vertical Orientation	U