serial

a unique number assigned for identification to a single unit in a series, such as a firearm or a piece of electronic equipment

a person who murders three or more people over a period of more than a month, with a significant period of time between the murders

a person who commits a series of murders, often with a similar method

a person who commits a series of rapes

a person who continuously comes up with new ideas and starts new businesses

the act of committing a series of murders

the crime of intentionally killing a person in a series of events

a story broadcast on television or radio in a set of parts