Pillars

noun

1. A large post, often used as supporting architecture.
2. Something resembling such a structure.

   "a pillar of smoke"

3. An essential part of something that provides support.

   "He's a pillar of the community."

4. A portable ornamental column, formerly carried before a cardinal, as emblematic of his support to the church.
5. The centre of the volta, ring, or manege ground, around which a horse turns.