A pick tremolo is played with the pick held in the right hand and involves a rapid playing of a note with continuous alternating down and up strokes of the pick, played as fast as possible. The pick tremolo is indicated by diagonal lines, as shown in the example below. Hold the pick close to the tip and make the rapid movements from the wrist rather than the arm.
This lick uses the pick tremolo technique along with hammer-ons.
This one uses pick tremolo on a slowly bent note. Notice also the use of vibrato in this lick.
Here the pick tremolo is used on several consecutive notes.