Maybe you're referring to this; the Axis Mundi, but let me doubt of it, because if it was the case you wouldn't ask for it here, anyway here's the definition.
The axis mundi (also cosmic axis, world axis, world pillar and center of the world) is a symbol representing the center of the world where the heaven (sky) connects with the earth. Different cultures represent the axis mundi by varied symbols such as a natural object (a mountain, a tree, a vine, a stalk, a column of smoke or fire) or of a product of human manufacture (a staff, a tower, a ladder, a staircase, a maypole, a cross, a steeple, a rope, a totem pole, a pillar, a spire). Its proximity to heaven may carry implications that are chiefly religious (pagoda, temple mount, church) or secular (obelisk, minaret, lighthouse, rocket, skyscraper). Additionally, the axis mundi may be feminine (an umbilical providing nourishment), masculine (a phallus providing insemination into a uterus), or neither (e.g the omphalos (navel).
The axis mundi features prominently in cultures utilizing shamanic practices or those with animist belief systems. Yet it also appears in the most technologically advanced cultures—wherever the impulse persists to link a tower with the idea of a "world center."
[link to www.newworldencyclopedia.org