兵器
へいき · heiki · JLPT N1 · noun
weaponry
⚔️ 兵 = soldier + 器 = tool: a soldier's tools, which means weapons
兵 (heī, soldier) + 器 (ki, implement or vessel). The same 器 appears in 容器 (container), so 兵器 is a implement made for soldiers.
兵 — axe 斤 + two hands 廾
Originally a pictograph of two hands gripping an axe or weapon, depicting a soldier wielding arms. The ancient form clearly showed 斤 (axe) held by 廾 (two hands). The meaning naturally extended from 'weapon' to 'soldier,' 'troops,' and 'military.'