locket
/ˈlɒkɪt/noun
1
- a small ornamental case, typically made of gold or silver, worn round a person's neck on a chain and used to hold things of sentimental value, such as a photograph or lock of hair纪念品盒（珍藏亲人相片和头发, 可挂在颈上做装饰的小盒, 通常用金银制成）。
2
- a metal plate or band on a scabbard剑鞘上的金属板（或镶圈）。
词源
late Middle English (in sense 2)： from Old French locquet, diminutive of loc 'latch, lock', of Germanic origin; related to LOCK1. Sense 1 dates from the late 17th cent.