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30:34 ·
This ideogram is found both in earlier and present-day systems. In the earliest system of Chinese writing the similar  meant village (a pictorial sign for the central field and well).
In alchemy  meant urine. As a meteorological sign signifies that the ground is wet ( means flooded ground).
Placed diagonally, it was sometimes used by alchemists to mean sulphur although it was more usual to represent sulphur with  or  .
In the French and US system of hobo signs and similar structures are signs for danger. See, for example,  , this water is dangerous to drink;  , dangerous neighborhood; and  , here lives a man with a bad temper. In some fire protection contexts it has signified the whereabouts of a police station. In military contexts has been used for vehicle driver, and for orderly.
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