A skull.

The name by which the KJV (Luke 23: 33) denotes the place where our Lord was crucified. Calvary is merely an English form of the Latin word calvaria, which is itself a translation of the Hebrew word Golgotha, a skull. The popular expression “Mount Calvary” is not warranted by any statement in the Gospels. There is no mention of a mount in any of the narratives of the crucifixion.

See Golgotha.