You see these all the time in movies, usually when some poor guy has been wrongly imprisoned and begins counting the days since his incarceration, but what are these markings called? I used to know, but I've forgotten and now it's really bugging me.

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You see these all the time in movies, usually when some poor guy has been wrongly imprisoned and begins counting the days since his incarceration, but what are these markings called? I used to know, but I've forgotten and now it's really bugging me.
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They are called tally marks.
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