rivet, tack, thumbtack, (kokuji)
鋲 centers on a small metal fastener: a rivet, tack, or thumbtack. It is a kokuji created in Japan to name these metal pins.
鋲 is a Japanese kokuji formed by combining 金 (metal) with 兵 (soldier/weapon), likely to represent a metal pin or fastener used in armor or construction.
The metal radical 金 on the left and 兵 (soldier) on the right suggest a metal soldier standing firm: a rivet or tack that holds things together like a tiny metal guard.
For びょう, imagine a rivet being hammered with a loud 'byou!' sound: byou -> びょう, and the metal tack is driven in.
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rivet; tack; thumbtack; drawing-pin; hobnail
drawing pin; thumb tack
metal ornament in shape of a woman's breast
round-headed tack; drawing pin
road stud; raised pavement marker
riveter; riveting machine
rivet gun
riveter; riveting machine
rivet; tack; thumbtack; drawing-pin; hobnail
round-headed tack