A child’s imagination and wonder should be encouraged. I for one, believe this kid is speaking the truth, as I will explain:
There is no hard/fast rule that says a number of English-speaking mathematicians have to agree with your choice of name for any nameless number out there. So yes, a child or anyone else, may name a number anything they like. Numbers are concepts, not real objects. So, imagining its name is good enough to make it true.
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