circlet
/ˈsɜːklɪt/noun
1- a circular band, typically one made of precious metal, worn on the head as an ornament（尤指由贵金属制成作为头饰的）箍圈。
1.1
- a small circular arrangement or object小圈饰; 小圈。
词源
late Middle English: from CIRCLE + -ET1 , perhaps reinforced by archaic French cerclet.