x_{1} is a geometric figure/form/shape [polytope, tessellation, etc.] that is similar to the regular one given by Schlafli symbol x_{2}

Any generalization of the basic/classic Schlafli symbol is allowed in x2. See also: tai'e'i.

- tai'e'i
- mekso unary operator: basic Schlafli symbol composer (defined only on ordered lists)