The sign geometry is defined by an overall height 'a' with a typical one-inch corner radius. A nine-inch diameter black circle with a white border is centered at a typical spacing from the edge. The message area is positioned with vertical offset dimensions 'b', 'c', and 'd', incorporating equal spacing and centered horizontal alignment.
9" Ø BLACK CIRCLE WITH WHITE BORDER, TYP. WHITE a EQ. c/2 R 1" TYP. d c b l MESSAGE
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