Terminator

1) In astronomy, the terminator is the line between the day side and the night side of a planetary body. Examination of the terminator can yield information about the surface of the body; for example, a fuzzy terminator indicates the presence of an atmosphere.

2) In genetics, a terminator marks the end of a gene on the DNA for transcription.

3) The Terminator is an American motion picture involving a cyborg that has been sent back through time to "terminate" or kill a woman whose life will have importance in the future.

4) In electronics, a device at the end of a transmission line or bus, designed to match impedance and hence minimize reflections of the signal.