圆锥曲线

• 囗(encircling ring; surrounding loop)RADICAL
• 员(member)PHONETIC

A circle is a shape that is completely enclosed and closed like a member held within embracing arms.

• 曰(mouth open; speak)RADICAL
• 丨丨(two vertical strokes indicating a curve)ASSOCIATIVE

The character 曲 shows a vessel's mouth with two curved walls, evoking the image of a bent and winding elbow.

• 糸(thread; silk)RADICAL
• 泉(stream; water)PHONETIC

A thin thread flows like a small stream running long and continuously.