One-line description of a story, like those that appear regularly in TV Guide, aimed at making someone want to watch it--telling the reader what this story is about.
an extremely short description of the plot, characters, theme, and genre of a screenplay used to pitch or synopsize scripts during the development stage.
A log line is a brief summary of a television program or movie, often providing both a synopsis of the program's plot, and an emotional "hook" to stimulate interest.
A graduated line used to measure the speed of a vessel through the water or to measure the velocity of the current from a vessel at anchor. See current line.