What's the name of this letter?

omega

sigma

delta

lambda

Sigma is a commonly used symbol of addition.

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Answers by country

Greece

100%

Estonia

92%

the United Kingdom

12%

75%

12%

Australia

75%

12%

Poland

70%

11%

7710

the United States

23%

69%

Russia

15%

65%

France

21%

63%

10%

Germany

14%

59%

20%

India

27%

54%

18%

Ukraine

16%

50%

11%

Italy

23%

46%

17%

126

Belarus

30%

40%

20%

Austria

25%

33%

41%

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