The radical niku is typically at the left side of a composition and drawn as: 月, which looks equal to: "moon, month 月" but has the meaning 'body part'.
Image of a hand 一 forearm 丨 and pulse 丶. It was originally also the distance of one inch (Length: 1 SUN = 3.03 cm) from the hand's palm to the pulse. This also stood for a small amount. In the mnemonic, it is used as "skillful hand" and partly also "to measure".
Tip: Go to the radicals that are contained in this character and learn all the characters with this radical systematically!
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