A marker that takes the place of deleted data, allowing for replication of the deletion across servers etc.
A crashdump.
To take part in tombstoning: to jump into the sea, etc. from a cliff or other high point so as to enter the water vertically straight.
For a surfboard to stand upright half-submerged in the water (like a tombstone, above) because the surfer is underwater with his or her legrope pulled tight. Often this indicates a surfer in difficulty, either held down by the power of a wave or unconscious and unable to get to the surface.
To replace (an object or data) with a tombstone marker.
A gravestone, a grave marker: a monument traditionally made of stone placed at the head of a grave.