Prose
S. B. U. II. 12
In plain words
This entry is a print artifact, not Sanskrit text: a page-reference code ('S. B. U., II, 12') carried over from the running header of the source edition, with no verse or commentary content of its own to render.
Close to the Sanskrit
This is not a sentence of Śaṅkara's Sanskrit at all. It is a page/volume locator printed in the source edition's running header -- a citation code, not prose to translate.