The axe is one of the oldest tools developed by humans; since the Neolithic age, it has been a symbol of battle and work. All ancient traditions associated the axe with lightning, water, and fertility, and attributed to it the power of making or stopping rain. It is a symbol of spiritual penetration and fertilization, as it opens the ground. The twin-bladed axe is often associated with the Hindu thunderbolt, so it is a symbol of celestial illumination. Related to the ox because of its shape, and can be a general talisman of strength.