This radical was developed from a circle with a central dot as the image of the sun. As you can hardly draw circles or dots with a brush, it became the current rectangular shape.
Image of a hand 一 forearm 丨 and pulse 丶. It was originally also the distance of one inch (Length: 1 ts'wun = 3.72 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".
Tip: Go to the radicals that are contained in this character and learn all the characters with this radical systematically!
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