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  2. File:Empty vector heart.svg - Wikipedia

    en.wikipedia.org/wiki/File:Empty_vector_heart.svg

    Download QR code; In other projects ... An empty red vector heart as seen in review ratings by Danish newspaper ... A red vector heart with an outline and no fill.

  3. Klein bottle - Wikipedia

    en.wikipedia.org/wiki/Klein_bottle

    A 6-colored Klein bottle, the only exception to the Heawood conjecture. Six colors suffice to color any map on the surface of a Klein bottle; this is the only exception to the Heawood conjecture, a generalization of the four color theorem, which would require seven. A Klein bottle is homeomorphic to the connected sum of two projective planes. [7]

  4. Harvey balls - Wikipedia

    en.wikipedia.org/wiki/Harvey_balls

    The use of Scalable Vector Graphics to render Harvey balls allows them to be easily used in web browsers and applications that support the XML vector graphics format. The benefit is that no special font is required and the Harvey balls can be displayed using an open format.

  5. Horror vacui (art) - Wikipedia

    en.wikipedia.org/wiki/Horror_vacui_(art)

    In visual art, horror vacui (Latin for 'fear of empty space'; UK: / ˌ h ɒ r ə ˈ v æ k j u aɪ /; US: /-ˈ v ɑː k-/), or kenophobia (Greek for 'fear of the empty'), [1] is a phenomenon in which the entire surface of a space or an artwork is filled with detail and content, leaving as little perceived emptiness as possible. [2]

  6. Reuse of bottles - Wikipedia

    en.wikipedia.org/wiki/Reuse_of_bottles

    Examples of returnable glass milk bottles from the late 19th century. A reusable bottle is a bottle that can be reused, as in the case as by the original bottler or by end-use consumers. Reusable bottles have grown in popularity by consumers for both environmental and health safety reasons. Reusable bottles are one example of reusable packaging.

  7. Geometric primitive - Wikipedia

    en.wikipedia.org/wiki/Geometric_primitive

    Vector graphics consists of geometrical primitives.. In vector computer graphics, CAD systems, and geographic information systems, geometric primitive (or prim) is the simplest (i.e. 'atomic' or irreducible) geometric shape that the system can handle (draw, store).

  8. Marston Mat - Wikipedia

    en.wikipedia.org/wiki/Marston_mat

    Marston Mat repurposed for storage of empty wine bottles on a farm in Normandy in 2007. Hooks and slots along long edges clearly visible A huge quantity of Marston matting was left in the Philippines by the U.S. forces after World War II. Many of these were re-purposed as fencing material in housing projects that were built after the war.

  9. Table of mathematical symbols by introduction date - Wikipedia

    en.wikipedia.org/wiki/Table_of_mathematical...

    Download QR code; Print/export ... (to denote images of specific elements) Øystein Ore: 1940 (in the present form of f: X → Y) Witold Hurewicz: ∅. empty set sign ...