This command will hide your current selected target (make it invisible). NOTE: this command will hide a target from view and disable both collision and AI however, the target is still 'present' and things such as scripting for the NPC/target will still take place.
disable Target Command
disable
The above command will "disable" (make invisible) your currently selected target. This is the only way you can execute the disable command. If you do not have a target selected, this command will not work.