shapecatcher.com : Unicode character recognition.

Unicode character information

Double-struck n-ary summation


Displayed on your computer as: ⅀
(if the character is not rendered properly, you may not have the appropriate fonts)

Unicode name: Double-struck n-ary summation
Alternative names: Codepoint (hexadecimal): 0x2140
Codepoint (decimal): 8512
In unicode block: Letterlike Symbols

Html entities:

⅀ or ⅀

Character input:

There is no universal input system for Unicode characters. But you can use the system specific input methods below.

Windows: Hold down Alt and press + on the numeric keyboard. Type: 2140 and release Alt. A registry key needs to be enabled for this to work. See Unicode input (wikipedia) for more details.
Linux: Hold down Crtl and ⇧ Shift and type U2140. Now press ↵ Enter and release Crtl and ⇧ Shift.

Other Infos:

General category: Sm (Math_Symbol): A symbol of primarily mathematical use.
Bidirectional class is: ON (Other_Neutral): Most other symbols and punctuation marks.
Canocial combining class is: 0 (Not_Reordered): Spacing and enclosing marks; also many vowel and consonant signs, even if nonspacing.