What does "Six Sigma DFX" mean?

A type of design. DFX: Design for X, which can be translated as "Design for X" or "Design for XX".

Where X can represent the full life cycle of a product or a part of the life cycle. For example, assembly, manufacturing, testing, maintenance, and so on.

For example:

DFSS: Design for six sigma

DFA: Design for assembly

DFP: Design for Procurement

DFM: Design for Manufacturing DFM: Design for Manufacturing

DFT: Design for Test

DFD: Design for Diagnosibility

DFA: Design for Assembly amp; Maintainability Design for Reliability & Maintainability

DFC: Design for Cost