A 25 Torx bit is 25 What???

The number stands for ft pound if it a 25 it's 25ft pounds of torque ect ect
Nope. A Torx 25 has a torque range of 12-14 lb-ft. A Torx 25 is a group 2 head and 5 is at the mid point of the group 2 range of 8-20 lb-ft.