the.com/triviality
A fact so small it survives only as ammunition at parties.
means Something of little importance or value, or the quality of being unimportant and minor.
from From Latin trivium, the place where three roads meet — a public crossroads where common, idle chatter happened, hence the unremarkable and everyday.
Road mathTri plus via: literally three roads crossing.
Medieval schoolTrivium meant grammar, logic, rhetoric — basic studies.
Math senseMathematicians call obvious proofs trivial, sometimes smugly.