Which type of guidance allows for stealthy engagement by not emitting signals?

The type of guidance that allows for stealthy engagement by not emitting signals is infrared guided. This method relies on detecting the heat emitted by a target rather than actively sending out signals. Infrared guidance systems use the thermal signatures of objects to track and engage them, making it difficult for adversaries to detect the incoming weapon until it's too late.

This stealth characteristic is crucial in military operations where surprise and anonymity are key advantages. By not emitting detectable signals, infrared-guided systems can avoid countermeasures that might be employed against active systems, like radar or radio guidance. As such, infrared guidance is favored for stealth missions and scenarios requiring low visibility.

While other guidance types such as radar, laser, and radio systems are effective in their own right, they typically involve some level of signal emission that could be detected by enemy systems, potentially compromising the element of surprise.