If we name them the same as multiple births following the pattern of triplets, quadruplets, quintuplets, etc. it would be nonuplets.
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enneahedron
nonagon
A nine sided shape is called a nonagon.
It is called a nonagon. There currently is no official name for a nine-sided polygon. However, two names have been proposed for such a figure: the first is a Nonagon; the second is an Enneagon.
a shape with nine sides is called nonagon