What does CSK stand for?

Confederacy

Confederate States of America, also called Confederacy, in the American Civil War, the government of 11 Southern states that seceded from the Union in 1860–61, carrying on all the affairs of a separate government and conducting a major war until defeated in the spring of 1865.

Countersink

A tapered recess, cut around a pilot hole for a screw, to receive the head of the screw. To enlarge the top part of a hole at an angle for a flat-head screw. Also, the tool that is used. 

Code Shift Kwying

Compilation Setup Kit

Clsrc Kinase

C-Terminal Src Kinase

Cable Sleevhng Kit

Camqra Starter Kits

Can'T Stop Killing