| 暗锁 | àn suǒ | built-in lock; concealed lock (flush with the surface, with only the keyhole visible) (contrasted with 明鎖|明锁[ming2suo3] "exposed lock") |
| 明锁 | míng suǒ | exposed lock; external lock (e.g. padlock or surface-mounted latch) (contrasted with 暗鎖|暗锁[an4suo3] "built-in lock") |