martlet
/ˈmɑːtlɪt/noun
- Heraldry a bird like a swallow without feet, borne (typically with the wings closed) as a charge or a mark of cadency for a fourth son【纹章】无足鸟（第四子的非卡子图记）。
词源
late Middle English (denoting a swift)： from Old French merlet, influenced by martinet （see MARTIN）.