U+339C Square Mm
U+339C was added to Unicode in version 1.1 (1993). It belongs to the block
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
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 
UTF8  E3 8E 9C 
UTF16  33 9C 
UTF32  00 00 33 9C 
URLQuoted  %E3%8E%9C 
HTML hex reference  ㎜ 
Wrong windows1252 Mojibake  ãŽœ 
Encoding: EUCKR (hex bytes)  A7 AE 
Encoding: JIS0208 (hex bytes)  AD D0 
Adobe Glyph List  squaremm 
Elsewhere
Complete Record
Property  Value 

1.1 (1993)  
SQUARE MM  
SQUARED MM  
CJK Compatibility  
Other Symbol  
Common  
Left To Right  
Not Reordered  
Square  


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NA  
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Yes  
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No  
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None  
Wide  
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—  
No_Joining_Group  
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Ideographic  
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not a number  


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