The alchemical sign for air is a triangle whose apex points upward, its upper part crossed through by a horizontal line(although sometimes the tip is removed).The symbol is reminiscent of that of fires and represents passive heat, from which its association with air is derived. In alchemical thought, air is in constant opposition with earth. The element of air is symbolized by a gable bird man and a pair of lungs in a three dimensional representation of the icon of air: a triangle with a line through it