Risk factor
The risk factor was the inherent level of risk involved in an action.
In 2269, Kaz noted that his plan for the USS Enterprise to disintegrate after the dual Enterprise-IKS Klothos ship left the Delta Triangle had a high risk factor, given how long it would take to execute and Captain James T. Kirk's naturally suspicious mind. (TAS: "The Time Trap")
In 2366, when Captain Jean-Luc Picard queried whether Geordi La Forge had analyzed the risk factor in a proposed maneuver, the chief engineer claimed their chances of success or failure were even money. (TNG: "Booby Trap")