罗氏线圈

• 罒(net; mesh (variant form))RADICAL
• 夕(evening; dusk)PHONETIC

Spreading a net at dusk to catch birds is the original meaning of the character.

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

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

• 囗(surround; square)RADICAL
• 卷(roll; book)PHONETIC

A circle is a closed boundary that wraps around, like a rolled paper forming a complete loop.