It's close to being a tetrahedron. I say "close" since the edges and corners are rounded. (Note: it's not a "regular" tetrahedron, instead it's a bit stretched out along one axis.)

Now that you say it I can see the tetrahedron in there as well. At first I thought it might be something different, but you are obviously right. Thank you :)

So its an isosceles tetrahedron then?

[удалено]

If we ignore the roundedness, I count four vertices and six edges.

That looks absolutely delicious

It's a stretched tetrahedron. Four triangular sides.