The trigger position refers to the position of the cylinder core (also rotor) in which it is possible to pull out the key. As a rule, the key is in a vertical or horizontal position. In standard cylinders, the cam is at 30° or 270°, depending on the manufacturer. The cylinder is considered here from the outside.
With special cylinders, several trigger positions are possible, but restrictions may be expected here with locking systems (e.g. switch cylinders with several switch positions for rotary electric switches of various makes).