Q:

What does "cx_" prefix stand for in package names? 

I see cx_ prefix in package names like cx_Oracle or cx_Freeze.  What does it mean?  If it's an acronym, how to decrypt it? 

A:

You'd better ask the author about that)
However, I have a strong theory that it's derived from "Computronix" - the name of the company Anthony worked for:

These are a bunch of projects that I have worked on at Computronix and which they have agreed to release as open source.  See Computronix Open Source Utilities.