The number of letters determines the number of face types so oo would mean 2 face types which are regular. Extending this to 4d we could have [o][oo] for rit, as it has two cell types, regular and quasiregular.

You can also notate for non-snubless semiuniforms. For example, the isosceles triangle gets o|x. The o represents the vertex with two similar edges and the x represents the vertices with two different edges.

We can extend this into a system for notating polytopes. (Polytopes with snubless semiuniform verfs also get the signature for their verf at the end) Of course, cases like the tetrahedral octahemihexahedron and the rhombicosahedron cannot be distiguished, even including the verf, so this notation is not perfect yet.

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`tet - 3o(3o)`

oct - 3o(4o)

cube - 4o(3o)

ike - 3o(5o)

doe - 5o(3o)

tic - 4x3o

sirco - 4o3o2x

co - 4o3o(2x)

rit - [4o3o][3o(3)](3o2x)

gogishi - [5/2o(3)](3o(3))

squappy - 4o[1o|2x(4)]

sidtid - 5/2o3o(3x)

gid - 5/2o3o(2x)