Index fossils are one of the species from the assemblage of species that characterise the zone.

They started by highlighting that just like any other economy, there are the two opposing forces that characterise the growth of the digital economy.

Western politicians and sections of the mainstream media in Europe continue to characterise the current tide of refugees seeking safe haven abroad as young, male and opportunistic.

It is widely used for regular expressions, which is the context in which it was introduced by Stephen Kleene to characterise certain automata, where it means zero or more .