cenotaph (n.)

"empty tomb erected in honor of a dead person who is buried elsewhere or whose body is lost," c. 1600, from French cénotaphe (16c.), from Latin cenotaphium, from Greek kenotaphion, from kenos "empty" (see keno-) + taphos "tomb, burial, funeral," related to taphē  "interment," thaptō "to bury," which is of uncertain origin. It is traditionally derived (along with Armenian damban "tomb") from a PIE root *dhembh- "to dig, bury," but there are doubts, and Beekes writes, "Armenian and Greek could well be borrowings; IE origin is uncertain." Related: Cenotaphic.