"Donut Earth Theory.
Yes, some people on the internet are arguing that Earth is neither flat, nor spherical, but torus-shaped, which is a fancy science word for something that looks like a donut. The idea first appeared on FlatEarthSociety.org in a 2008 thread started by a mysterious figure named Dr. Rosenpenis as a joke, but it was fleshed out in detail by FES trailblazer Varaug in 2012."
https://www.vice.com/en/article/mbyak8/apparently-some-people-believe-the-earth-is-shaped-like-a-donut-1
"A planet in the shape of a donut, or toroid, as it's called in mathematics, could technically exist, but it would have to jump some steep physics hurdles to get there. Planets are round because gravity pulls inward. To keep the hole, or hub, at the center of a toroid planet from collapsing, you'd need an equal outward force. Centrifugal force (the force you feel when a spinning merry-go-round nearly sends you flying) could do the trick, but it would mean that the planet would have to rotate at an extremely high rate."
https://www.discovery.com/science/donut-shaped-planet
"According to the laws of physics, a planet the shape of a donut, or toroid, could actually exist — but it's extremely unlikely to ever form naturally."
https://gizmodo.com/what-would-the-earth-be-like-if-it-was-the-shape-of-a-d-1515700296