You're reading the documentation for an older, but still supported version (GL013300).
For information on the latest version, please have a look at GL013301.

JOG_AXIS

This is an enumeration type constant that refers to each axis that executes jog control in the robot controller, and is defined as follows.

Rank	Constant Name	Description
0	JOG_AXIS_JOINT_1	No. 1 joint or axis of robot
1	JOG_AXIS_JOINT_2	No. 2 joint or axis of robot
2	JOG_AXIS_JOINT_3	No. 3 joint or axis of robot
3	JOG_AXIS_JOINT_4	No. 4 joint or axis of robot
4	JOG_AXIS_JOINT_5	No. 5 joint or axis of robot
5	JOG_AXIS_JOINT_6	No. 6 joint or axis of robot
6	JOG_AXIS_TASK_X	X axis of robot TCP
7	JOG_AXIS_TASK_Y	Y axis of robot TCP
8	JOG_AXIS_TASK_Z	Z axis of robot TCP
9	JOG_AXIS_TASK_RX	RX axis of robot TCP
10	JOG_AXIS_TASK_RY	RY axis of robot TCP
11	JOG_AXIS_TASK_RZ	RZ axis of robot TCP

Defined in: DRFC.h

typedef enum {
    JOG_AXIS_JOINT_1 = 0,
    JOG_AXIS_JOINT_2,
    JOG_AXIS_JOINT_3,
    JOG_AXIS_JOINT_4,
    JOG_AXIS_JOINT_5,
    JOG_AXIS_JOINT_6,
    JOG_AXIS_TASK_X,
    JOG_AXIS_TASK_Y,
    JOG_AXIS_TASK_Z,
    JOG_AXIS_TASK_RX,
    JOG_AXIS_TASK_RY,
    JOG_AXIS_TASK_RZ,
} JOG_AXIS;