SO: /S-O/ n. 1. (also `S.O.') Abbrev. for Significant Other,
almost invariably written abbreviated and pronounced /S-O/ by
hackers. Used to refer to one's primary relationship, esp. a
live-in to whom one is not married. See MOTAS, MOTOS, MOTSS.
2. [techspeak] The Shift Out control character in ASCII (Control-N,
0001110).