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  2. Prism (geometry) - Wikipedia

    en.wikipedia.org/wiki/Prism_(geometry)

    Prism (geometry) In geometry, a prism is a polyhedron comprising an n-sided polygon base, a second base which is a translated copy (rigidly moved without rotation) of the first, and n other faces, necessarily all parallelograms, joining corresponding sides of the two bases. All cross-sections parallel to the bases are translations of the bases.

  3. Substitution cipher - Wikipedia

    en.wikipedia.org/wiki/Substitution_cipher

    t. e. In cryptography, a substitution cipher is a method of encrypting in which units of plaintext are replaced with the ciphertext, in a defined manner, with the help of a key; the "units" may be single letters (the most common), pairs of letters, triplets of letters, mixtures of the above, and so forth. The receiver deciphers the text by ...

  4. Gothic alphabet - Wikipedia

    en.wikipedia.org/wiki/Gothic_alphabet

    The Gothic alphabet is an alphabet used for writing the Gothic language. It was developed in the 4th century AD by Ulfilas (or Wulfila), a Gothic preacher of Cappadocian Greek descent, for the purpose of translating the Bible. [1] The alphabet essentially uses uncial forms of the Greek alphabet, with a few additional letters to express Gothic ...

  5. Rhombohedron - Wikipedia

    en.wikipedia.org/wiki/Rhombohedron

    Rhombohedron. In geometry, a rhombohedron (also called a rhombic hexahedron[ 1][ 2] or, inaccurately, a rhomboid[ a]) is a special case of a parallelepiped in which all six faces are congruent rhombi. [ 3] It can be used to define the rhombohedral lattice system, a honeycomb with rhombohedral cells.

  6. Archaic Greek alphabets - Wikipedia

    en.wikipedia.org/wiki/Archaic_Greek_alphabets

    Greek alphabet. Many local variants of the Greek alphabet were employed in ancient Greece during the archaic and early classical periods, until around 400 BC, when they were replaced by the classical 24-letter alphabet that is the standard today. All forms of the Greek alphabet were originally based on the shared inventory of the 22 symbols of ...

  7. Pentagrammic prism - Wikipedia

    en.wikipedia.org/wiki/Pentagrammic_prism

    Pentagrammic prism. In geometry, the pentagrammic prism is one of an infinite set of nonconvex prisms formed by square sides and two regular star polygon caps, in this case two pentagrams . It is a special case of a right prism with a pentagram as base, which in general has rectangular non-base faces. Topologically it is the same as a convex ...

  8. Rectangular cuboid - Wikipedia

    en.wikipedia.org/wiki/Rectangular_cuboid

    A rectangular cuboid is a convex polyhedron with six rectangle faces. These are often called "cuboids", without qualifying them as being rectangular, but a cuboid can also refer to a more general class of polyhedra, with six quadrilateral faces. [ 1] The dihedral angles of a rectangular cuboid are all right angles, and its opposite faces are ...

  9. A New Formula for Pi Is Here. And It’s Pushing Scientific ...

    www.aol.com/lifestyle/formula-pi-pushing...

    And It’s Pushing Scientific Boundaries. While building a simpler model for particle interactions, scientists made a sleek new pi. Representations of pi help scientists use values close to real ...

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