The Spirit Ball is an attack used and developed solely by Yamcha. The attack is performed by placing one hand forward with the other gripping the arm for either support or delivering more energy flow into the one hand. He forms a ball of yellow-orange energy like a small Spirit Bomb and manipulates it by placing his two first fingers upward from the palm as if he's doing the Explosive Wave. Using this attack, Yamcha can hit the enemy several times with something of a physical attack only from long range.

From Dragon Ball Wiki, a Wikia wiki.