The shape was chosen by analogy with the common triangular road hazard signs in Germany that denote warnings to motorists. Here, a triangle is called inverted because its base is up while one of its angles points down.
In addition to color-coding, some groups had to put letter insignia on their triangles to denote country of origin. For example, a red triangle with an "F" on it denoted a political prisoner from France.
There were many markings. A prisoner would typically have at least two, and possibly more than six:
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Political
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Habitual Criminals
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Emigrants
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Jehovah's Witnesses
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Gay males
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Vagrants
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Basic colors
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Red triangle
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Green triangle
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Blue triangle
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Purple triangle
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Markings for Repeaters
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Red bar above triangle
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Green bar above triangle
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Blue bar above triangle
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Purple bar above triangle
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Pink bar above triangle
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Black bar above triangle
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Inmates of Penal Battalions
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Circled black circle under red triangle
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Circled black circle under green triangle
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Circled black circle under blue triangle
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Circled black circle under purple triangle
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Circled black circle under pink triangle
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Circled black circle under black triangle
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Markings for Jews
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Red triangle over uninverted yellow triangle
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Green triangle over yellow triangle
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Blue triangle over yellow triangle
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Purple triangle over yellow triangle
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Pink triangle over yellow triangle
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Black triangle over yellow triangle
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Special Markings
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Male Race Defiler: Thick outline of black triangle over uinverted yellow triangle
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Female Race Defiler: Univerted yellow triangle over black triangle
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Escape Suspect: A circled red circle under the appropriate star
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Inmate Number: A white rectangle with serial number
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Applicable marks were worn in descending order as follows: Inmate Number, Repeater Bar, Triangle or Star, Member of Penal Battalion, Escape Suspect
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Pole: "P" on a red triangle
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Czech: "T" on a red triangle
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Member of the Armed Forces: Univerted red triangle
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Special Inmate: Brown arm band
Form and Color of Markings of Camp Inmates in the Concentration Camps
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