Saidin is a term from the fantasy series The Wheel of Time by Robert Jordan. It refers to the male half of the One Power, which is a mystical force used by channelers to perform magic. Saidin is characterized by its raw, chaotic energy and is often associated with strength and power. In the series, Saidin is tainted by the Dark One, leading to madness for those who use it. This creates a significant conflict for male channelers, as they struggle with the risk of losing their sanity while trying to harness their abilities.