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English
Noun
danger triangle (countable and uncountable, plural danger triangles)
- (countable) A triangular sign warning of danger.
1908, Claude Johnson, Roads Made Easy: By Picture and Pen, volume 3, The Car Illustrated, page 56:3 miles farther (9 before Kendal) there is a danger triangle on the L, “Plough Inn” on the L, and a caution board on the R of a steepish descent, and here the road forks into two.
1911, Motor Age, volume 19, number 26, page 8:The best was to cope with this problem would be the use of three different sizes of the red danger triangle.
1934, The Autocar, volume 73, page 81:We tackled the mountain side again, and climbed on and up through a fairyland of silver birches till at length we came to a real sign of human activity—a rusty old danger triangle, leaning at a rakish angle!
1959, Colliery Guardian, volume 199, page 23:Reflectors and a danger triangle are also fitted to rear of the trailer.
1980 August, Belgium Post Report, page 3:Modifications include changing front-turn indicators and parking lights to white, adding kilometer markings to the speedometer, removing bulbs from or painting over side-turn indicators, installing two red reflectors and one fog light on the rear of the car, stamping the chassis number on the chassis itself, directing the exhaust system to straight rear or pointing slightly left, and adding an approved fire extinguisher, a first aid kit, and a danger triangle to the car.
2024, Heidi Krömker, editor, HCI in Mobility, Transport, and Automotive Systems: 6th International Conference, MobiTAS 2024; Held as Part of the 26th HCI International Conference, HCII 2024; Washington, DC, USA, June 29–July 4, 2024; Proceedings, Part I, Springer:The fitness to drive indicator when entering an alarm state is also turning orange and causing the danger triangle to light up.
- (uncountable, anatomy) Clipping of danger triangle of the face.
1957, The Year Book of Dermatology and Syphilology, volumes 1956-1957, page 207:Dermatologists traditionally have warned patients with acne to keep their hands away from their faces and not to pick and squeeze, especially in the “danger triangle” bounded by the nasolabial folds and the upper lip.
1989, C. Roland Leeson, Thomas S. Leeson, Human Structure, B.C. Decker, page 119:The facial vein is valveless, and infection in its area of drainage (the danger triangle) may involve retrograde spread to the cavernous sinus, either via ophthalmic veins or through the pterygoid plexus, with thrombosis of the sinus.
2003, Janet Simms, A Practical Guide to Beauty Therapy: Level 2, Nelson Thornes, page 149:Within the greasy T-zone is an area referred to as the ‘danger triangle’. The client may be tempted to squeeze spots that appear there. This should be warned against very strongly. Behind this area are important blood vessels which connect with the brain. Fatalities have resulted from deep-seated bacterial infections behind the danger triangle, caused by skin damage.