Also layer or slab. Nine cubelets. The 3x3 cube is 3 slices deep any way you look at it. The slices are numbered , and , relative to a face. If slice(s) are not specified in a move, it means slice 1, i.e., the face itself.
An OLAP function. It is an operation whereby a subset of a multi-dimensional array (or cube) corresponding to a single value for one or more members of the dimensions not in the subset is selected at a given concept level. A slice of a cube is also the result of a slice operation. For example, if the member United States is selected from the Location dimension, then the sub-cube of all the remaining dimensions is the slice that is specified. The data omitted from this slice would be any data associated with the non-selected members of the Location dimension, for example Canada, Mexico, etc. From an end user perspective, the term slice most often refers to a two-dimensional page selected from the cube.
A spatial volume one voxel thick i.e. a 2-D image. Usually refers to an entire time-series (e.g. trial or run), and as such can be thought of as a volume with time as the third dimension.