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Greek Capital Letter Sigma ALT Codes

ALT+228

To type greek capital letter sigma Σ on your computer, Just hold down the Alt key while typing the alt key code 228 on the numeric keypad of your keyboard. If you don not have one, hold down the Fn and Alt keys while typing the alt code number.
Symbols » Alt Codes » Alt Codes ( ᗩᒪ☂ ℃ṎᗪḘṦ )