danger triangle

Definitions

1. 1

   A triangular sign warning of danger.

   • 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.
   • The best was to cope with this problem would be the use of three different sizes of the red danger triangle.
   • 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!
2. 2

   Clipping of danger triangle of the face.

   • 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.
   • 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.

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