truncheon
/ˈtrʌntʃən/noun
1- chiefly Brit. a short, thick stick carried as a weapon by a police officer〈主英〉警棍。
1.1
- a staff or baton acting as a symbol of authority, especially that used by the Earl Marshal（尤指英国王室典礼大臣所用的, 象征权威的）官杖, 权杖。
词源
Middle English （denoting a piece broken off (especially from a spear), also a cudgel）： from Old French tronchon 'stump', based on Latin truncus 'trunk'.