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%

Russia

75%

10%

Poland

70%

11%

7350

the United States

30%

70%

the United Kingdom

13%

66%

20%

Germany

19%

61%

15%

In which EU country is the Cyrillic script used?

Phoenician alphabet was the first to use ...

Hieroglyphs

Symbols representing whole words

KIout writing

Symbols representing sounds

What is that?

Who initiated the work on the Linux system?