Quote from American Heritage Dictionary:

"An act of breaking through an obstacle or restriction. A major achievement that permits further progress."

Description:

In Atlantean times this pictogram was called BREAKTHROUGH. There is no death to be feared, rather there is a transmutation of energy into different levels. The three-layered pyramid, archetype of body, mind, spirit, has become more and more solid as the Atlantean age progresses. Here it has been broken asunder by the roaring Serplion rising from abysmal depths.

The Serplion represents psychic energy, the link between the known and the unknown. The Serplion has cradled the potential collective unconscious of emerging humanity.

Interpreted use:

Body, mind and spirit are in transition. Transformation is ongoing.

Reversed (card received upside down):

Dissolution into a lower level of the water of the unconscious. Try swimming.