Shorthand version for the Star Trek TV series "Deep Space Nine".
Also sometimes termed as "
DSN", "Deep Space 9", "ST:
DS9".
3 letter terminology is consistant with other shorthand references to other Star Trek TV series.
ie. TOS,
TNG, DS9, VOY, ENT
I watch
DS9 because unlike
TNG, individuals don't always
get along with other characters and so it makes it more interesting.