Which component in the Survival Kit is used for signaling?

The component in the Survival Kit that is primarily used for signaling is the signaling mirror. Signaling mirrors are specifically designed to reflect sunlight and create a bright flash that can be seen from a distance. This is incredibly valuable in emergency situations where you need to attract attention to your location. The reflective surface allows the user to send signals both during the day and, when combined with specific techniques, makes it possible to signal at greater distances.

While other items like a whistle are also used for signaling, the effectiveness and range of a signaling mirror generally surpass that of auditory signals produced by a whistle. The knife and burn ointment serve different functions, primarily focused on survival and first aid rather than signaling for help. Therefore, the signaling mirror is the most effective tool for this purpose within the context of the Survival Kit.