铁菱 Traditional form: 鐵菱 Pinyin (reading): tiělíng Definitions: (military) caltrop (spiky metal device laid on the ground to create a hazard for enemy horses or troops in ancient times) Characters: 铁 - iron; strong, solid, firm 菱 - water chestnut, water caltrop Traditional characters: 鐵 - iron; strong, solid, firm 菱 - water chestnut, water caltrop