Kuuenzan

"With the correct timing, higher and further jumps are possible while airborne. Kuuenzan may be activated while attacking in the air."

- In-game text

Kuuenzan or Kūenzan (空円斬), also known as "Air Circling Slash", is one of the two special techniques that Zero learns after defeating Split Mushroom in Mega Man X4. It is a spinning attack activated by pressing the attack button in mid-air, and it replaces the original jump attack. 

Trivia

 * In Tatsunoko vs. Capcom, this is the only command art to be a normal attack of his, with it being his jumping H. Zero however, will turn to face his opposite direction when doing his jumping H from a double or high jump.

Similar Weapons

 * C-Sword from Mega Man X5
 * Ensuizan from Mega Man X6
 * Rasetsusen from Mega Man X8

Counterpart to this Technique

 * Soul Body