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intracoastal waterway
In the UK it is an emergency diversionary sign for motorways and primary routes.
I think you might be thinking of a trapezium. A triangle with the top point sliced off by a line parallel to the base.
First off, its isosceles. An isosceles triangle is a triangle with two sides that have the same length. A triangle with 3 sides the same length is called equilateral, but it is also a form of an isosceles. Note also that an isosceles will have two or more angles the same.
octagon