Here you go...
Use . for a point and | for a line segment
For a regular polygon of n sides, write G followed by the number of sides. So G4 is a square, G7 is a heptagon, and G38 is a 38-gon.
For the regular polyhedra, use T, C, O, D, and I for tet, cube, oct, doe, and ike respectively.
For the polychora, use P, S, E, R, A, and X for pen, tes, hex, ico, hi, and ex respectively.
For higher dimensions, use Tn for n-simplex, Cn for n-cube, and On for n-cross.
This is fairly simple. After a regular polytope, put "t" for truncation and then a "truncation code". The truncation code is easy to determine, simply write the diagram of the shape, and converts x to 1 and o to 0. So t1 is regular, t2 is rectified, t3 is truncated, t4 is birectified. etc. So O…
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This wiki's 200th page is pentachoron. Nice job everyone!
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