Lì yīn 歷音 “Continuous sound” or 长拂 (trad. 長拂) Zhǎng fú
Run the thumb, index, or middle finger across 5 to 8 strings in a continuous, usually slow motion. Li yin can be played toward or away from the performer and is considered a subtype of Huazhi.
Kwok suggests some sources suggest using only 3 to 4 strings.