Predetermined spots where everyone leaving the building should meet during a fire or fire drill are called ?

Assembly points.

Explanation:

Predetermined spots where everyone leaving the building should meet during a fire or fire drill are called assembly points.

This ultimately implies that, an assembly point is a designated safe location or area where different people are instructed to stay while being evacuated from a dangerous area such as during fire, gas explosion, flood or other emergency situations.

Simply stated, an assembly point is mainly a place of safety and succor for victims of a disaster, in the event of an evacuation.