A 3 dimensional triangle is called a pyramid, otherwise a 2D three sided polygon shape is exactly what you called it, a triangle.
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an isosceles triangle has only 2 equal length sides and a scalene triangle has no equally lengthen sides. obviously they are in the shape of a triangle.
A bow-tie type connection of 2 triangles.
The next of an octahedron looks like a series of 8 triangles.
Make a triangle out of straws or something. See if you can push it sideways like a square. I you try to, you either bend it, break it or push the entire thing sideways... You can't bend it like a square. this is why triangles is the strongest shape. And also tall skyscrapers are made from triangles if looked from a birds eye-view... :D:D:D
Those would be SIMILAR triangles.