The shapes that have 3 sides and 3 vertices are called triangles. Triangles are classified based on the lengths of their sides and the measures of their angles. The three most common types of triangles are equilateral triangles (all sides and angles are equal), isosceles triangles (two sides and two angles are equal), and scalene triangles (all sides and angles are different).
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A polygon is a closed figure bounded by sides only. Triangle is the polygon of 3 sides and 3 vertices.
For two dimensional shapes, a vertex (plural vertices) is a point where two sides meet.For 3D shapes, a vertex is a point where three or more faces meet.
A shape with four sides has four vertices and a shape with three sides has three vertices, so a shape with four sides has more vertices than a shape with three sides.
Identify shapes of common objects. Identify faces, vertices, and edges of solid shapes; sort solid objects by faces, edges, and vertices. Relate solid shapes and plane shapes. Identify and count vertices and sides of shapes. Use shapes, such as pattern blocks, to make new shapes. Identify the movement of a shape as a slide, flip, or turn. Recognize and draw congruent figures
There is no special name: they are polygons, as are shapes with 3 or 3 million sides.