I've only encountered this in fiction, basically shuriken (usually spike shuriken). "Anqi" 暗器 means "hidden device" or "secret device", with, I think, an implication that it is small, able to be held in the hand. Throwing spikes small enough to hide in the hand would be a good example.
It could also refer to hidden sleeve spike-throwing "guns", which I also only know from fiction (and the profusion of modern fake antiques).
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