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For example, a flag of a polyhedron comprises one vertex, one edge incident to that vertex, and one polygonal face incident to both, plus the two improper faces. A polytope may be regarded as regular if, and only if, its symmetry group is transitive on its flags. This definition excludes chiral polytopes.
Animation of a half-turn ambigram of the word ambigram, with 180-degree rotational symmetry [1]. An ambigram is a calligraphic composition of glyphs (letters, numbers, symbols or other shapes) that can yield different meanings depending on the orientation of observation.
Common design elements of flags include shapes such as stars, stripes, and crosses, layout elements such as including a canton (a rectangle with a distinct design, such as another national flag), and the overall shape of a flag, such as the aspect ratio of a rectangular flag (whether the flag is square or rectangle, and how wide it is) or the ...
Related: 30 Best Christmas Poems That Will Fill Your Hearts With Holiday Cheer 'Bah Humbug' Meaning. To start with, "bah" is a word used to show contempt. This is why that word alone portrays ...
This is a list of flags, arranged by design, serving as a navigational aid for identifying a given flag.Uncharged flags are flags that either are solid or contain only rectangles, squares and crosses but no crescents, circles, stars, triangles, maps, flags, coats of arms or other objects or symbols.
This article summarizes the classes of discrete symmetry groups of the Euclidean plane. The symmetry groups are named here by three naming schemes: International notation, orbifold notation, and Coxeter notation. There are three kinds of symmetry groups of the plane: 2 families of rosette groups – 2D point groups; 7 frieze groups – 2D line ...
The rainbow pride flag underwent another change in 1979 after it was discovered that the center stripe on the seven color flag was blocked by the lamp posts they hung from in San Francisco.
Illustration of the duality between points and lines, and the double meaning of "incidence". If two lines a and k pass through a single point Q, then the polar q of Q joins the poles A and K of the lines a and k, respectively. The concepts of a pole and its polar line were advanced in projective geometry.