core-core index
n.— «If we look at what is known as the “core-core” index (which strips out both energy and fresh food) then we can see that it is far from clear that Japan ever really escaped from the deflation trap, since this reading has been completely flatlining around (and normally slighly below) zero over the last twelve months, and with a very large capacity overhang now developing, this index will almost certainly get back into negative territory very, very soon.» —“Will This Be Japan’s Longest Running Recession?” by Edward Hugh Seeking Alpha Dec. 1, 2008. (source: Double-Tongued Dictionary)