Most ice hockey sticks come as single units that have the shaft and the blade fused together at the factory. You can also get hockey shafts and blades separately so that you can mix and match them to fine tune your hockey stick to your liking. You can even cross pollinate shafts and blades from different manufactures. When you buy the shafts and blades separately, they are called two piece hockey sticks (for obvious reasons). And yes, the single units are called one piece hockey sticks.

The primary advantage of going with a two piece configuration is the ability to replace just a blade or just a shaft if either of them gets broken. This can save you a significant amount of money in the long run.