airgap

Noun

air gap (plural air gaps)

1. (computer security) A network security measure that consists of ensuring that a secure computer network is physically isolated from unsecured networks, such as the public Internet or an unsecured local area network.
   • The structure and design of Stuxnet confirms the Iranian air gap, as the attackers clearly designed Stuxnet to jump an air gap utilizing multiple methods.2016, William D. Bryant, International Conflict and Cyberspace Superiority: Theory and Practice, Routledge, →ISBN, page 153

   Synonyms:

   airwall

2. A gap where there is a vacuum (not actually air), used to reduce power consumption in microelectronics.
3. A type of spark gap using a tube filled with air (which is mostly nitrogen), nitrogen alone, or other gases.