I'm thinking about a mnemonic for 令, and my wife mentioned that in former times the emperor's orders were written on tablets called 箭牌. However, I cannot find any information about this word, and the Google image search does not yield any tablets. How are these tablets referred to in Chinese?
I now that there's also 诏书, but this seems to relate more to orders written on paper. Am I right?
I tried to find a translation or even the right word by googling "emperor order tablet ", but nothing showed up. As I'm not a native English speaker: Am I missing the right word?