The story
From Nevada + triangle. From being a triangular area mostly in Nevada. Coined in analogy to the Bermuda Triangle.
Etymology from Wiktionary, CC BY-SA 4.0.
Nevada Triangle
Today it means: A region bounded by the vertices at Reno, Nevada, US; Las Vegas, Nevada, US; Fresno, California, US; containing part of the Sierra Nevada (a mountain range in the Rocky Mountain Cordillera); the triangle falling mostly in the U.S. state of Nevada; where many plane crashes occur and planes disappear. Full definition →