Yā tán 压弹 (trad. 壓彈) or Yā náo 压猱 (trad. 壓猱)

A light vibrato performed on several strings at once. Place the palm of the left hand on the strings to the left of the movable bridges. Run the right hand across several strings to perform a glissando. Press and release the left hand into the strings quickly several times.