Shockwave from the Fingertips is a kiai barrage technique utilized by third form Frieza in the manga.
In the anime Frieza instead uses the extremely similar Crazy Finger Beam technique.
Frieza repeatedly flicks the index and middle fingers on both of his hands in the direction of his opponent, firing multiple kiais at the opponent at a very rapid rate, inflicting a great deal of damage.
Frieza uses this attack during his battle against Piccolo. The attack is too fast for Piccolo to dodge or even see and he is left severely beaten. However, Gohan soon explodes with rage and attacks Frieza with the Full Power Masenko, saving Piccolo from certain death.