30:22 · 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.
    Many modern homosexuals utilize this symbol to communicate their type of sexuality to others. This sign can be seen on bumber stickers, key chains, jewelry and many other personal items.