The Galactic Empire: An Empire Reborn
Imperial Officers' Manual
Major Revision: 2.0 – 2008.10.31
An adaptation of the pre–Endor document and policies.
RIP
... The ISB General's Rank Insignia ...

There is only one ISB General at any given time, who is the ISB's Division Commander, and charged with overseeing the entire Imperial Security Bureau.

The term "ISB General" is ubiquitous, being both a rank and a position, which refer to a single individual.

The ISB General is granted level 425 X access in #Galactic_Empire.