A simplex, possibly.
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I am in 5th grade
3x
a polyhedron * * * * * That is only if it is bounded by plane faces. A sphere, for example, is a three dimensional shape but is not a polyhedron: it is a solid shape.
142 * * * * * What?! A hexagon is a polygon - a closed plane shape - which is bounded by six straight lines. The name comes from the Greek prefix hex- for six.
It could be an arrowhead or a kite.