This symbol is a clear example of the symbol called compound, with a double allegorical and hermetic interpretation. Traditionally the hourglass has been accepted as an allegory of the passage of time. When it’s depicted with wings and a scythe or skull it wants to symbolize the brevity of human life. The grains of sand fall slowly but steadily, and before we know it the bottle has emptied. Let’s remember St. Matthew (XXV: V 13) "Watch, because you know neither the day nor the hour", or the song of the Psalm (LXXXIX: V 49) "What man will live and not see death?". In the hermetic interpretation, we can suggest that the hourglass by turning on itself, indicates to us the possibility of the return to the origins. This symmetrical shape of the bottle, with its double compartment, shows us the principle of correspondence. This principle announced by Hermes Trimegist, a Greek name, means Hermes the Three Times Great, and his identity reaches the origins of pre-Pharaonic Egypt. Other interpretations argue that Hermes was not an individual personality, but a set of teachings elaborated in the Hellenistic world. Plutarch believes that Hermes, was the first in ancient Egypt, who knew the writing of the gods, which more than writing were signs, and knowing these signs and their correct pronunciation, was a decisive action. This principle of correspondence, the second of its seven principles, comes to say: "How it is above is below, and how it is below is above," and thus describes a holistic model of the entire created universe. Similar is the movement of electrons orbiting the nucleus of the atom, as is the movement of planets around the Sun. The emptiness and fullness of this double bottle must follow one another continuously, creating a current from the upper to the lower, one can say from "Heaven" to "Earth", and by this same principle of correspondence, a another reverse current from the Earthly to the Celestial. This would be the image of the hermetic and alchemical interpretation of this symbol.