1.
needle
A thin, pointed metal instrument used for sewing, knitting, or medical purposes.
2.
hand (of a clock)
The pointer on a clock or gauge that indicates the time or measurement.
3.
acupuncture
Short for 鍼治療 (acupuncture treatment).
Usage: 針 refers to needles in general and clock hands. In medical contexts, it often means acupuncture.