HSK C7-9
Correct

纽

/ niǔ / 
Strokes

Definition

to turn/to wrench/button/nu (Greek letter Νν)

Example

As a Noun

handle; knob

As a Noun

button

As a Noun

bond; tie

As a Noun

key position; pivot

As a Noun

newly-grown fruit of melons, gourds, etc