Looks like one of Jimmy Neutron's incomplete inventions A.K.A a Stub.
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Neutron is the surname of a family living in Retroville, and consist of Hugh Neutron, Judy Neutron and their genius son Jimmy Neutron, an abnormally intelligent young child and inventor who stars in the animated television show of the same name. Although these are the Neutrons featured most prominently, there are other family members.
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Family members