That's a type of pro taper if it's a 314, euro taper on the Z. The number of taper types is virtually endless, regardless of the names. A cue maker can use any of many "taper bars" which is a kind of guide, or can make his own.
Generally, a pro taper is "straight" for (x) inches from the ferrule before it begins gradually increasing in diameter. The euro type is "conical". The length of the taper, the number of "steps" of the tapering, the angle, etc, etc, etc...
There really is no limit. If someone wants it, and is willing to pay for it, it can be done.
Ask this question in the Ask The Cuemaker section, and you could get an education far beyond your imagining. The depth of mathematical acumen that many of these guys possess - as a result of machining background, etc - is pretty staggering considering the modest living they earn.