Freesurfer CRAS offset

Hi,
as a background, our team is trying to formalize nilearn issue with CRAS offsetting in .gii files.
I am trying to find out what CRAS abbreviation means. Freesurfer documentation has zero information considering CRAS orientation. Any ideas?

CRAS is the translation from the central voxel to the RAS center of the image.

In some documentation it’s referred to as Pxyz_c. Some useful references in nibabel:

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