the hub stands for discipline, which is the essential core of meditation practice.
its overall shape is that of a circle, representing the perfection of the dharma teaching.Other notes on the symbolism of the eight-spoked wheel of life in Buddhism: They are said to have sharp edges to cut through ignorance. The eight spokes represent the Noble Eightfold Path of Buddhism. The simpler form of the wheel of life has eight spokes and is primarily used only in Buddhism rather than in all the dharmic religions. These are the evils which are responsible for the trapping of souls within the Six Realms. The rooster represents ignorance or delusion. The pig represents greed, desire, or attachment. In the hub, the center of the wheel, a pig, snake, and rooster turn in a circle, each biting the tail of the next animal. The other side is the Dark Path, which represents how souls may move downward to the World of Hell. One side is the White Path or Path of Bliss, and represents how souls may move upward to the World of Gods. The rim of the hub is divided into two sides. In Buddhist representations of the wheel, within each of the Six Realms, there is always at least one buddha or bodhisattva depicted, trying to help souls find their way to nirvana. Sometimes, the wheel is represented as only having five spokes because the World of the Devas and the World of the Asuras is combined into a single world. Between the World of Animals and the World of Hungry Ghosts, at the very bottom of the wheel, is the World of Hell. The World of Animals and the World of Hungry Ghosts is always in the bottom half of the wheel, with the World of Animals bordering the World of Humans and the World of Hungry Ghosts bordering the World of Asuras. The World of Asuras and the World of Humans are always in the top half of the wheel, bordering the World of Devas on opposite sides, but which of the two is on the left and which is on the right varies (leading to two different arrangements of the wheel). The World of Devas is always at the very top of the wheel. the World of Asuras, Demigods, Jealous Gods, or Titans.The six spokes divide the wheel into six sections which represent the Six Worlds (or Realms) of Existence. The outer rim of the wheel is divided into twelve sections and given such names as the Twelve Interdependent Causes and Effects or the Twelve Links of Causality. The exact figure or symbol varies common examples include the moon, a buddha, or a bodhisattva. There is always a figure or symbol in the upper left and the upper right. A common choice for the figure is Yama, the god of death. The wheel of life is represented as being held by the jaws, hands, and feet of a fearsome figure who turns the wheel. The more elaborate form of the wheel of life has six spokes (or sometimes five, as described in more detail below) and is used in all the dharmic religions. The Wheel of Life, a Buddhist painting from Bhutan