紫外线

• 此(this; here)PHONETIC
• 糸(silk thread; silk)RADICAL

A silk thread dyed in this distinctive purple color is the noble color of the imperial palace.

• 夕(evening; crescent moon (pictographic))RADICAL
• 卜(divination; fortune-telling)PHONETIC

Evening outside divining fortunes under the moon — that's an external affair.

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

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