tombstone

Short definition from Wiktionary

Noun

1. 1
   A grave marker, a stone slab or similar object marking a person's grave.
2. 2
   The symbol "∎" marking the end of a proof.
3. 3
   A marker that takes the place of deleted data, allowing for replication of the deletion across servers etc.
4. 4
   A crashdump.
5. 5
   An unusual morphological feature on an electrocardiogram indicative of acute myocardial infarction, characterized by a massive ST elevation.
6. 6
   A printed advertisement in a newspaper or magazine, typically having unadorned centered text in black and white, enclosed in a simple box.
7. 7
   A museum plaque or caption displaying information about a work of art or exhibited object.
8. 8
   A pawnbroker's ticket.

Verb

1. 1
   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.
2. 2
   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.
3. 3
   To replace (an object or data) with a tombstone marker.

Proper noun

1. 1
   A city in southeastern Arizona.