Definition:Rubik's Cube/Center Facet

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Of each of the $9$ facets of each face of Rubik's cube, the ones in the centers of the faces are called the center facets.

The set of center facets can be denoted $S_Z$.

The set of center facets is:

$S_Z = \set {F, U, R, L, B, D}$

Linguistic Note

In the notation $S_Z$ for the center facets of Rubik's cube, the subscript $Z$ is for zentrum, which is German for center.

$C$ cannot be used, because $S_C$ is already in use as the symbol denoting the set of corner facets.