Parallelogram geometric region; symbolic region consumed by region functions and rendered in Graphics
Parallelogram[p, {v1, v2}]
Graphics[Parallelogram[]]
→ -Graphics-RegionDimension[Parallelogram[{0, 0}, {{1, 0}, {1, 1}}]]
→ 2RegionEmbeddingDimension[Parallelogram[{0, 0}, {{1, 0}, {1, 1}}]]
→ 2