A set of seven twins is called septuplets.
Septuplets
A set of twins (2 babies) is called twins. Seven sets would still be twins. 7 babies born together (not twins) would be called septuplets.
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Any set of twins that are not identical (whether it's boys or girls or a combination of the two) are fraternal twins.
Its possible. My great-uncle and great-aunt were twins. I could have been a twin, but I am not.
Buildings
No there were no twins reported.
The Box Set - Cocteau Twins - was created in 1991.
The same as when you had the first set of identical twins.
Set - Thompson Twins album - was created in 1982-02.
Yes babies can be called twins. Also when they grow up they"ll still be called twins.
Yes, I have two sets of twins, and one set of triplets.
Yes. I own a set of twins. I believe that twins happen more often than in humans, but still uncommon. I can't remember where I read this.