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2:3 ·
A circle segment that is as big as half a circle, or bigger, represents elements or substances fundamental to society's or the individual's livelihood. In chemical notation it stands for the all-important element for earth's life forms, carbon.
In the English system of hobo signs means keep away - no use knocking, and in the same system means a good haystack for the night.
Compare with the following signs from Group 24: spring or well; the modern , water for firefighting or firefighting equipment; and .
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