Octadecagon and 2{9/4} or two enneagrams, {18/6} is reduced to 6{3} or 6 equilateral triangles, and finally {18/9} is reduced to 9{2} as nine digons. Deeper truncations of the regular enneagon and enneagrams can produce isogonal (vertex-transitive) intermediate octadecagram forms with equally spaced vertices and two edge lengths. Other truncations form double coverings: t{9/8}={18/8}=2{9/4}, t{9/4}={18/4}=2{9/2}, t{9/2}={18/2}=2{9}. The regular octadecagon is the Petrie polygon for a number of higher-dimensional polytopes, shown in these skew orthogonal projections from Coxeter planes: Octadecagon An octadecagon (or octakaidecagon) or 18-gon is an eighteen-sided polygon. A "regular octadecagon" has a Schläfli symbol {18} and can be constructed
How Many Miles to Babylon? In the 1824 edition of "The Scottish Gallovidian Encyclopedia" there's a description of the rhyme and the game, giving the distance as "six, seven or a lang eight". The rhyme was originally accompanied by a singing game in which two lines face each other, with one player in the middle. At the end of the rhyme the players have to cross the space and any caught help the original player in the middle catch the others. The game seems to have fallen out of use in the twentieth century. In literature In film In music How Many Miles to Babylon?