Krillin's trademark attack, an energy projectile flattened to razor-sharpness.
You can hold the Punch button for as long as you want, it keeps the disc above Krillin's head and can act like a protective umbrella of sorts.
Releasing the button launches the disc, which is flung across the screen at great speed.
It is blockable, but does higher-then-average block damage. Also, delaying the throw does not power up the disc when thrown.
You can change it's trajectory with the directional buttons upon throwing the disc. Holding forward makes it travel forward faster and
holding back slows it's speed a bit. Holding Down arcs it down a bit while holding Up arcs it upwards. You can combine these features
by holding the diagonal directions (Up-Forward, Down-Backwards, etc).