Anyone know the legal (or otherwise) significance of the abbreviation "C. S." when placed after a signature?

Example: First Middle Last, C.S. (This is your Signature)

John Quincy Doe, C.S.

Came across this when researching the accepted for value process. An author suggested its use in the acceptance language:

All Offers Accepted for Honor
Upon Proof of Claim
EIN# xx-xxxxxxx
First Middle Last, C.S. (This is your Signature)
without recourse
Attorney in Fact