U+2140
⅀ Double-Struck N-Ary Summation
Double-Struck N-Ary Summation is Unicode character U+2140 in the Letterlike Symbols block.
About Double-Struck N-Ary Summation
Double-Struck N-Ary Summation is a Unicode character in Math. Copy the symbol itself, or use the HTML, CSS, and JavaScript formats when a code escape is safer.