needle
鍼 centers on a needle, especially a metal one used in acupuncture or sewing.
鍼 combines 金 (metal) with 咸, which likely contributes the sound and may relate to piercing or a needle-like shape. The exact historical development of 咸 in this context is uncertain.
The left side is metal 金, and the right side 咸 looks like a sharp tool with a guard. Picture a metal needle used for acupuncture.
For シン, imagine a thin metal needle: thin -> シン, and the needle is made of metal.
acupuncture and moxibustion
(acupuncture) needle
Meiji College of Oriental Medicine
acupuncture point
acupuncturist
acupuncturist
acupuncture
acupuncture treatment
acupuncturist and practitioner of moxibustion
acupuncture and moxibustion clinic
acupuncture therapy
acupuncture
anesthesia by acupuncture