Emergency Code Fourteen was a designation employed by those belonging to the Jedi Order.
The designation, Code Fourteen, was utilized by Grand Master Yoda as a signal for pre-selected Jedi to convene at his position in times of emergency.
In the course of the Incident at the Jedi Temple, Yoda had prompted Qui-Gon Jinn in conjunction with Tahl to acknowledge this signal and proceed to a secure chamber.