Meaning of 'bs' or 'cbs'

LambdaX

I wonder what's the meaning of 'bs' or 'cbs' in the morphs name.

ex) *_body_bs_Body or body_cbs_spine1_*

What do they stand for?

crosswind

base shape and corrective base shape, I was once told.

LambdaX

Thank you! 

crosswind said:

base shape and corrective base shape, I was once told.