triangular pyramid
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The base word for a many sided figure is polygon.All four sided polygons are called quadrilateralThe sub groups of planar (2 dimensional) quadrilaterals are:-rectangle (a special kind of parallelogram)square (a special kind of rectangle (rhomboid))trapeziumrhombus (an equilateral quadrangle which must also be a parallelogram)parallelogramThese are also called quadrangles (as they have four angles as well as four sides).A three dimensional shape with four faces (surfaces) is called a tetragonTetragons have six edges and four vertexes, each where three edges and three faces meet. A triangular pyramid is a tetragon. it is the simplest three dimensional shape.
Solid Geometry
A cube could be described as a box, or as a three dimensional square.
Solid figures are normally classed as 3 dimensional objects
A shape that has 10 sides (two dimensional) is called a decagon. A shape that has 10 faces (three dimensional) is call a decahedron.