It's a blended whiskey, versus single malt, which is what most of us have been discussing.
Blended whiskeys are mixes of whiskeys from different distilleries. The advantage of a blend is that you can more easily balance out more extreme characteristics of each individual whiskey. Also, it can be done with exceptional consistency. That's why Johnny Walker Black or Platinum or Blue or whatever always tastes the same.
A single malt is composed of whiskey from just one distillery. It is harder to balance out extreme characteristics, but enthusiasts would say that this allows for more interesting and expressive whiskey. Still, single malts are "blended" in their own way: the distillery selects different whiskeys from different barrels of different ages to get the desired result.
Beyond single malt, there is single barrel or single cask. A single cask whiskey is whiskey from exactly one barrel/cask. They tend to be even more hit or miss, as you might imagine.