U+2780 Dingbat Circled SansSerif Digit One
U+2780 was added to Unicode in version 1.1 (1993). It belongs to the block
This character is a Other Number and is commonly used, that is, in no specific script. The codepoint has the Digit value 1.
The glyph is not a composition. It has a Neutral East Asian Width. In bidirectional context it acts as Other Neutral and is not mirrored. The glyph can, under circumstances, be confused with 1 other glyphs. In text U+2780 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:
1 (one, unit, unity) is a number representing a single or the only entity. 1 is also a numerical digit and represents a single unit of counting or measurement. For example, a line segment of unit length is a line segment of length 1. In conventions of sign where zero is considered neither positive nor negative, 1 is the first and smallest positive integer. It is also sometimes considered the first of the infinite sequence of natural numbers, followed by 2, although by other definitions 1 is the second natural number, following 0.
The fundamental mathematical property of 1 is to be a multiplicative identity, meaning that any number multiplied by 1 equals the same number. Most if not all properties of 1 can be deduced from this. In advanced mathematics, a multiplicative identity is often denoted 1, even if it is not a number. 1 is by convention not considered a prime number; this was not universally accepted until the mid20th century. Additionally, 1 is the smallest possible difference between two distinct natural numbers.
The unique mathematical properties of the number have led to its unique uses in other fields, ranging from science to sports. It commonly denotes the first, leading, or top thing in a group.
Representations
System  Representation 

Nº  10112 
UTF8  E2 9E 80 
UTF16  27 80 
UTF32  00 00 27 80 
URLQuoted  %E2%9E%80 
HTML hex reference  ➀ 
Wrong windows1252 Mojibake  âž€ 
L^{A}T_{E}X  \ding{192} 
Related Characters
Confusables
Elsewhere
Complete Record
Property  Value 

1.1 (1993)  
DINGBAT CIRCLED SANSSERIF DIGIT ONE  
CIRCLED SANSSERIF DIGIT ONE  
Dingbats  
Other Number  
Common  
Other Neutral  
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None  
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—  
No_Joining_Group  
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Ambiguous (Alphabetic or Ideographic)  
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1  


U 