Sign

Sign was the property of being positive, negative, or zero.
E-Space had the quality of being a "negative universe" in contrast to N-Space's positive coordinates. (TV: Full Circle), Warriors' Gate, PROSE: Castrovalva) The Gateway had a zero coordinate value, (TV: Warriors' Gate) as did the planet Time. (TV: War of the Sontarans)
==See also==
*Polarity
Category:Mathematics from the real world