Niǎn 捻

There is some disagreement as to this term. Kwok says it is using the index finger and thumb to pluck two adjacent strings bent to the same pitch with a closing motion, seemingly similar to Chòngyīn 重音. If using own nails, Kwok says only the pads of the fingers should contact the strings.

Ferguson says this is using the thumb and index to pluck two adjacent strings in a gesture towards the performer.

A third source found copied around the internet (example: http://www.yueqixuexi.com/guzheng/20170528174868.html) says this is the alternation on two adjacent strings, thumb and index in closing motions, to create an effect similar to a tremolo, but softer.