- Pac-Man (allthetropes.org)
A well-known game developed by Namco (now Namco Bandai) from The Golden Age of Video Games, and one of the most popular games ever, Pac-Man was the first really successful Maze Game, and one of the first games to be popular with both sexes. It sparked a pop-culture phenomenon, and helped drive the early-1980s video game craze. Ironically, its poorly implemented Atari 2600 port helped turn Pac-Man Fever into Pac-Man Cancer. It also was the first video game to get an Animated Adaptation, with a reluctant Marty Ingels in the lead role.
- Drainage basin (Wikipedia)
A drainage basin is an area of land where all flowing surface water converges to a single point, such as a river mouth, or flows into another body of water, such as a lake or ocean. A basin is separated from adjacent basins by a perimeter, the drainage divide, made up of a succession of elevated features, such as ridges and hills. A basin may consist of smaller basins that merge at river confluences, forming a hierarchical pattern.