Cubiscript - A URL that encodes the published world using a short-code, such as http://game.cubiverse.net/is8hz or http://cubiverse.net/on3ek. When any player types this URL into their browser they will launched directly into the published game world.
Texture Atlas - A single square shaped texture that has multiple smaller textures tiled within it. This allows many textures to be "compressed" into a single texture and used to paint the faces of cubes.
Simulation Step - The server simulates the world multiple times a second, in-fact every 33ms or 30 times a second. During each simulation step all players are updated, mobs simulation, HUD elements sent, etc.