lithophane
noun
lith·o·phane ˈli-thə-ˌfān 
: porcelain impressed with figures that are made distinct by transmitted light
also : an object of this material
Example Sentences
Recent Examples on the Web All were asked to respond to specific technical questions related to each lithophane graphic to determine the accuracy of responses across all three groups. 
Jennifer Ouellette, Ars Technica, 31 Aug. 2022
Jennifer Ouellette, Ars Technica, 31 Aug. 2022 Word History
Etymology
borrowed from French, probably from litho- litho- + -phane, in diaphane diaphanous
First Known Use
circa 1889, in the meaning defined above