Salutation to You from the front and back. O All, Prostration from all sides. You are of infinite power and unsurpassable valour. You pervade all things, and therefore You are all !
Arjuna is able to see the grandeur of the Supreme uniformly in all ways, on all sides, and everywhere, not only in the special list of items Krishna enumerated (chapter 10). Therefore, he registers his obeisance from the front, back and all other sides. Everywhere is evident the immeasurable splendour.
Arjuna finds the Supreme present everywhere though rooted to Krishna’s personality. No place or thing marks any distinction in the Supreme’s presence. Krishna is all. Everything seen and conceivable is uniformly in Krishna!