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At a guess you're talking about road signs. Rectangular signs give information Triangular signs give warnings Circular signs give orders
They are referred to as "diamond-shaped". Geometrically, however, most US traffic warning signs are actually squares that have been rotated 45 degrees from horizontal, rather than diamonds, which have no right angles.Read more: What_shape_are_the_road_signs_that_give_warningIn other countries, road construction and other warning signs are generally triangular with a white or yellow background and a red border.
A triangular dipyramid.A triangular dipyramid.A triangular dipyramid.A triangular dipyramid.
"triangular" is an adjective, not a noun. So there is no object such as "the triangular". The triangular WHAT?
It is a triangular pyramid.It is a triangular pyramid.It is a triangular pyramid.It is a triangular pyramid.