If you're talking about the Culinary Triangle, it involves three types of cooking, boiling, roasting, and smoking, commonly done to meat.
The chemical composition of foods is changed during cooking.
changed
changed
small green triangle
The food Darkens
A useable taxiway
first line indent marker.
It indicates a slow moving vehicle.
It indicates a problem with the vehicle. Flat tire etc.
All three interior angles of a spherical triangle may be right angles.
The power in the Bermuda triangle is electricity, gasoline, cooking oil, some wind turbines and solar power.
Three parallel vertical lines. A bit like triangle ABC | triangle DEF, except that the lines are closer together.