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  • Onion routing, a technique developed in the mid-1990s and later employed by Tor to anonymize communications over a computer network.
  • Passive radar[citation needed]
  • Phoenix: A 2012–early-2015 satellite project with the aim to recycle retired satellite parts into new on-orbit assets. The project was initiated in July 2012 with plans for system launches no earlier than 2016.[34][35] At the time, Satlet tests in low Earth orbit were projected to occur as early as 2015.[36]