Air-gapped

An air-gapped wallet is a form of offline storage of your Bitcoin, similar to a cold storage hardware wallet. However, some subtle differences elevate the safety of air storage.

The main thing is that it is disconnected from all external networks, including the Internet, Bluetooth and NFC. Transactions are created and partially signed within the software, which generates a QR code or adds it to a microSD card.

This gap means that it is never directly connected to another device or network. In fact, there are no ports to connect them to anything else. https://m.stacker.news/39313