On February 20, 1974, while recovering from the effects of sodium pentothal administered for the extraction of an impacted wisdom tooth, Dick received a home delivery of Darvon from a young woman. When he opened the door, he was struck by the beauty of the dark-haired girl and was especially drawn to her golden necklace. He asked her about its curious fish-shaped design. "This is a sign used by the early Christians," she said, and then left. Dick called the symbol the "vesicle pisces". This name seems to have been based on his conflation of two related symbols, the Christian ichthys symbol (two intersecting arcs delineating a fish in profile), which the woman was wearing, and the vesica piscis.