Key in a computer “three-finger salute”

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Possible Answers: CTRL.

Random information on the term “CTRL”:

High Speed 1 (HS1), legally the Channel Tunnel Rail Link (CTRL), is a 109-kilometre (68 mi) high-speed railway between London and the United Kingdom end of the Channel Tunnel.

The line carries international passenger traffic between the United Kingdom and Continental Europe; it also carries domestic passenger traffic to and from stations in Kent and east London, and Berne gauge freight traffic. The line crosses the River Medway, and under the River Thames, terminating at London St Pancras International railway station on the north side of central London. It cost £5.8 billion to build and opened on 14 November 2007. Trains reach speeds of up to 300 kilometres per hour (186 mph) on section 1 (Channel Tunnel to Fawkham Junction) and up to 230 kilometres per hour (143 mph) on section 2 (Ebbsfleet International to London St Pancras). Intermediate stations are at Stratford International in London, and Ebbsfleet International Station and Ashford International in Kent.

CTRL on Wikipedia