While you will see this online, the official trademarked full form used by Hexagon is "Personal Computer Dimensional Measurement Interface Standard." The keyword "Standard" is official.

A machinist who had never written a line of code could now say to the PC, "Measure this hole." The PC would convert that click into DMIS language, send it to the CMM, and the CMM would obey.

Adds the ability to import 3D CAD files for faster and more accurate programming. PC-DMIS CAD++:

By naming the software PC-DMIS, the developers were signaling that the platform was built on this open standard. It wasn’t a closed, proprietary language; it was designed to speak the universal language of dimensional measurement.