The device used to **amplify** a **wireless signal** in networking is called a **wireless range extender** or **wireless repeater**. This device boosts the existing Wi-Fi signal, extending its coverage area and enhancing connectivity in spaces where the signal might be weak or spotty. By receiving the original signal and retransmitting it, range extenders help eliminate dead zones, improving overall network performance. They are particularly useful in larger homes or offices where multiple devices need stable internet access across various locations.