A stable wormhole is a type of wormhole that does not fit the classical theories of how such structures exist. They provided the first type of FTL travel for humans. The first stable wormhole, the Firenze Pass, led to the founding of Jefivah.
Travel by wormhole, both natural and artificially created, is known to cause “jump sickness” in some. Because of the multidimensional nature of wormholes, most humans cannot look directly into them without becoming violently ill.