the.com/mu
the answer to a question that assumed too much.
means a word or gesture meaning your question is malformed, so neither yes nor no applies.
from from chinese and japanese zen koans, where a monk answers 'does a dog have buddha-nature' with mu, unasking the question rather than answering it; the character means 'not' or 'nothing.'
koan originjoshu's dog koan made it famous
computing uselisp and prolog use mu for undefined values
not zeromu rejects the question, zero answers it