The front posts are called katte bashira (left side) and kyaku bashira (right side), and the rear ones are called kaku bashira (left side) and mukai bashira (right side).
柱は手前側のものを勝手柱（左）・客柱（右）と呼び、奥側は角柱（左）・向柱（右）と呼ぶ。