26:54 · The sign appears in the Egyptian hieroglyphic system. Drawn vertically, it much later became a symbol for Christ, vesica piscis, literally the air bladder of a fish. This sign is a symbol of virginity or purity. It often appears in a mandorla, i.e. surrounded by a radiating aurelia, or gloria, as in . The Cabbalistic mystics used to signify innocence.
    Compare with its graphic opposite , and you will se that the antographity corresponds to an antonymity of the same scope, the latter ideogram denoting sin, guilt, and lost innocence.
    In modern meteorology this structure can mean clear air or extremely good visibility. In some US meteorology, however, this structure turned 90 degrees, to , can stand for visibility reduced by smoke. The law of the polarity of meanings of elementary graphs seems to be at work here.