What does QC’D stand for?

Is it a short form of a verb in the past tense?

I would think it means something has been checked and possibly altered for “Quality Control”.

I tend to agree with the answer above.
“The item has gone through the Quality Control” – it has been QC’d.
Very slang, but people would know what it meant.

Qc D

P.C. Queen’s Privy Council for Canada C.C. Companion of the Order of Canada C.H. Order of the Companions of Honour Q.C. Queen’s Counsel M.A. Master of Arts LL.L. couldn’t find this one. LL.D. Doctor of Laws F.R.S.C Fellow of Royal Society of Canada