My "favorite" latest (intentional) confusion is from Intel who decided to name chips "Celeron" that are both Haswell-based and Atom-based. Why intentional you may ask? Because they can begin offering Haswell-based ones at first, get high praises for the performance of budget laptops, and then in new generations switch to the Atom-based Celerons, which can be anywhere from 2x as weaker to slightly less weaker, but costs Intel half the price to make them, and they could be offering them for the same price to OEMs, since it's "Celeron" after all.