Double-Struck N-Ary Summation ⅀

„Double-Struck N-Ary Summation” is a letter belonging to the modern Greek alphabet. It represents the sound ] in writing. It was that very letter which the Latin S and the Cyrillic С originated from. The uppercase letter is used as a symbol of summation in mathematics. As for physics, there it denotes a special type of elementary particles called hyperons. The numerical value of sigma is 200.

Unicode offers various sigma versions, including the doubly outlined sign of N-Ary Summation, which you can copy from this page. For most general purposes, the standard uppercase sigma Σ is likely the most suitable, as it's widely used in mathematics and physics.

Symbol „Double-Struck N-Ary Summation” jest zawarty w podbloku „Duży operator z suwem” bloku „Letterlike Symbole” i został zatwierdzony jako część wersji Unicode 3.2 w 2002 roku.