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  2. Nabla symbol - Wikipedia

    en.wikipedia.org/wiki/Nabla_symbol

    The nabla is a triangular symbol resembling an inverted Greek delta: [1] or ∇. The name comes, by reason of the symbol's shape, from the Hellenistic Greek word νάβλα for a Phoenician harp, [2] [3] and was suggested by the encyclopedist William Robertson Smith in an 1870 letter to Peter Guthrie Tait.

  3. Nazi concentration camp badge - Wikipedia

    en.wikipedia.org/wiki/Nazi_concentration_camp_badge

    Purple inverted triangle superimposed upon a yellow one representing a Jehovah's Witness of Jewish descent. Pink inverted triangle superimposed upon a yellow one representing a Jewish "sexual offender", typically a gay or bisexual man. Black inverted triangle superimposed upon a yellow one representing an "asocial" or work-shy Jew.

  4. Red triangle (Palestinian symbol) - Wikipedia

    en.wikipedia.org/wiki/Red_triangle_(Palestinian...

    This page is subject to the extended confirmed restriction related to the Arab-Israeli conflict. An inverted red triangle Since the Israeli invasion of the Gaza Strip, an inverted red triangle has been used by pro-Palestinian protesters. The red triangle as a Palestinian symbol dates back to the Arab Revolt, after which it was also used in the Palestinian flag. More recently, combat footage ...

  5. Black triangle (badge) - Wikipedia

    en.wikipedia.org/wiki/Black_triangle_(badge)

    An inverted black triangle, as used in badges. The inverted black triangle (German: schwarzes Dreieck) was an identification badge used in Nazi concentration camps to mark prisoners designated asozial ("a(nti-)social") [1] [2] and arbeitsscheu ("work-shy"). The Roma and Sinti people were considered asocial and tagged with the black triangle.

  6. Pink triangle - Wikipedia

    en.wikipedia.org/wiki/Pink_triangle

    An ACT UP member displaying the organization's trademark protest sign with an inverted, upward-pointing pink triangle. In the 1970s, newly active Australian, European and North American queer liberation advocates began to use the pink triangle to raise awareness of its use in Nazi Germany. [17]

  7. List of occult symbols - Wikipedia

    en.wikipedia.org/wiki/List_of_occult_symbols

    The tetractys is an equidistant and equiangular arrangement of ten points inside a triangle, akin to the fourth triangle number. It was developed by Pythagoras, and collectively signifies cosmic unity in the form of The Decad, as well as the musica universalis, or collective abstraction of the music generated by heavenly cosmic bodies.

  8. Glossary of mathematical symbols - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    3. Between two groups, may mean that the first one is a proper subgroup of the second one. > (greater-than sign) 1. Strict inequality between two numbers; means and is read as "greater than". 2. Commonly used for denoting any strict order. 3. Between two groups, may mean that the second one is a proper subgroup of the first one. ≤ 1.

  9. Valknut - Wikipedia

    en.wikipedia.org/wiki/Valknut

    Valknut variations. On the left unicursal trefoil forms; on the right tricursal linked triangle forms.. The valknut is a symbol consisting of three interlocked triangles.It appears on a variety of objects from the archaeological record of the ancient Germanic peoples.