@EliBenSasson suggests "validium" as a clearer name for plasma-with-snarks (aka zk rollup but with offchain data). That is: 
The goals of naming:
* Clearly communicate differences b/w 4 types of systems
* Each word should refer to a quadrant or an axis; a word referring to three of four quadrants is dumb
* Move away from using "ZK" for snarks that are being used for scalability and not zero knowledge
* Clearly communicate differences b/w 4 types of systems
* Each word should refer to a quadrant or an axis; a word referring to three of four quadrants is dumb
* Move away from using "ZK" for snarks that are being used for scalability and not zero knowledge
Of course, "zk rollup" could also be renamed to "validium rollup" or something similar over time.
