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
omega
sigma
delta
lambda
answers
Greece24
Estonia30
the United Kingdom77
the United States79
Australia18
Poland8520
Brazil21
France41
Germany210
the Netherlands32
Switzerland21
Ukraine39
Spain34
Austria29
Russia94
Mexico19
India24
Colombia24
Italy1046
Belarus18