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" the de Luce coat of arms: per bend sinister sable and argent, two lucies haurient counterchanged. The crest, the moon in her detriment, and the motto “Dare Lucem.” “The moon in her detriment” was a moon eclipsed, and the “lucies,” of course, were silver and black luces, or pikes, a double pun on the name de Luce. “Haurient” meant simply that the pikes were standing on their fishy tails. "
― Alan Bradley , The Dead in Their Vaulted Arches (Flavia de Luce, #6)