What is the sign of the Great Wall on the left of the middle cross on the right side of the ear of wheat?

It is a sign of safe production.

On both sides of the safety production sign are gears and ears of wheat with a cross in the middle. Sometimes the cross is a lighthouse, and the short version is a cross. Among them, 1 Safety first, prevention first is the slogan of safe production, 2 gears and olive branches represent industrial and agricultural production, 3 crosses represent hygiene, 4 lighthouses represent direction, and 5 represents green safety.

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