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