ko ban
A ko ban is the set of intersections prohibited for a particular player in a particular position at each moment of a particular set of moments, which might dynamically depend on the game's preceding move-history.
Sometimes ko ban refers to a prohibition of one particular intersection only, regardless of whether there are also additionally banned other intersections. Sometimes "ko ban" refers to a basic-ko only while "superko ban" refers to all prohibited intersections related to a cycle with a) any number of plays or b) more than two plays. Depending on usage, one might exclude suicide bans from a ko ban.