Because these embryos came from the same fertilized egg, they share identical genetic material and are called identical twins.

I used to tease Del and him by calling them "twins," because they were so completely different.

If these multiple twins are aligned in parallel they are called polysynthetic twins.

The latter are also called super twins.

Despite being called twins, the B4's turbochargers are not identical.

The new pair of vertices are called true twins of each other.

Twins born in this way are called fraternal twins.

Such births are usually called twins.

This circumstance often pushes them to become what is called discordant twins, one righty and one lefty.