The result was soft delete. Based on minimal participation, this uncontroversial nomination is treated as an expired PROD (a.k.a. "soft deletion"). Editors can request the article's undeletion. ✗plicit 23:41, 12 December 2021 (UTC)
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Sitting unsourced since 2006, I don't think Pierre is notable.
He seems to have at least existed, per this 1941 patent, so likely not a hoax: https://patents.google.com/patent/US2477637A/en?inventor=Mercier+Pierre&assignee=Pierre+Mercier&before=priority:19440101
I couldn't find anything else worthwhile that proved notability, but Google results are seriously smudged by mirrors and other people with the same name. wizzito | say hello! 22:59, 5 December 2021 (UTC)