This is a top in the shape of an egg. When it is spun very hard, it stands up on its tip like a hard-boiled egg.
Hiroi Michiaki: This is… what is this? Ah, this is that thing that, if you spin it hard, it stands up. There’s not really a name for it, but you do this and spin it sharply, and it stands in the same way a boiled egg stands up.