While some extensions to the notation have been proposed in the past, this is a common group of algorithms and the notation is already somewhat being used.

I propose that [A,B,C] = [A,B] [B,C].

After expanding, a cancellation in the middle gives A B A' C B' C'.

For example, [l', RUR'U', r] is a common 4x4x4 last layer algorithm.

This notation can be extended further -

[A,B,C,D] = [A,B] [B,C] [C,D] = A B A' C B' D C' D'

but I am yet to find a use for it :)

Finally, just as [A,B]' = [B,A], [A,B,C]' = [C,B,A].

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