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1. A three-sided polygon
   - trigon, trilateral
    
2. Something approximating the shape of a triangle
   "the coastline of Chile and Argentina and Brazil forms two legs of a triangle"
    
3. Any of various triangular drafting instruments used to draw straight lines at specified angles
    
4. A percussion instrument consisting of a metal bar bent in the shape of an open triangle

1. A small northern constellation near Perseus between Andromeda and Aries
   - Triangulum

Derived forms: triangles

Type of: constellation, drafting instrument, form, percussion instrument, percussive instrument, polygon, polygonal shape, shape

Encyclopedia: Triangle, Virginia