I see it pretty much every week - resumes that include a bunch of information that virtually no one outside the company would understand.
The most common example is probably store numbers. I often see things like "Store 138" on a resume, often in lieu of an actual location. Internally, someone can look up to see where store 138 is. Externally, they probably can't, and even if they could, why make them go to the trouble? Just tell them where your store is.
- Chaired the CPD Committee
- Won the Blakefield Award
- Coordinated the ABCDEF event
I could go on. All those things are probably valuable to include on a resume, but only if the person knows what you're talking about. Otherwise it's meaningless and a waste of everyone's time.
If you're only applying internally, by all means, go ahead and use company-specific terminology. But if you're searching externally, it's important to keep in mind that most people haven't worked for the same companies you have. They won't know all the same lingo.
Bottom line: If they don't understand your resume, they'll likely move on.
Best of luck!