Yes. Just like a square is 2D.
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Such a 2D shape is a hexagon, a six sided figure.
That would be - a Hexagon.
both 2D polygons, one 5sided, one 6 sided
A regular shape. ( square -regular rectange-, regular pentagon, regular hexagon, equilateral triangle etc. etc.)
In 3d a hexagonal pyramid. In 2d, two hexagons. Or a six-pointed star (like a Star of David), a parallelogram plus lots more possibilities