This cheap plastic yo-yo does not have anything special about it, although it is quite large for a yo-yo. Anyway, being fairly cheaply made, it ended up coming apart, and Tim was intrigued to see if it would still work, with only half the yo-yo present.
In fact it works quite well, and we think there is a certain amount of gyroscopic stability, despite the fact that it is lopsided in terms of mass.
So what do you call a functioning half yo-yo? We think it should just be a .... yo!