The Brussels effect is the process of unilateral regulatory globalisation caused by the European Union de facto (but not necessarily de jure) externalising its laws outside its borders through market mechanisms.
The California effect is the shift of consumer, environmental and other regulations in the direction of political jurisdictions with stricter regulatory standards. The name is derived from the spread of some advanced environmental regulatory standards that were originally adopted by the U.S. state of California and eventually adopted in other states.
The Brussels/California effects are when the EU/California make a law that applies to the EU/California but for various reasons is followed globally/across the US