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30:21 ·
A triangle within a circle is not so common in modern ideography as in earlier times. See, for example,  , which represented the elements in an alchemical context, and  as a symbol for the Christian idea of three-in- one, the Holy Trinity.
Compare with  and  , both of which denote the Holy Trinity, and with  , feu de roiie, which was perhaps some kind of fire oven in the seventeenth century.
According to Diderot's Encyclopedia meant both feu de Roue and coral.
In modern ideography we find this structure turned 180 degres to  used as a road sign, on office machines, and on household appliances to mean stop.
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