Grammar or am I just over-looking it?

[Janet Merai]

Can someone tell me what this form of use is?
I am confused with the upside-down and facing-up looking "ku"

Picture provided:

 

[epigene]

Those are simply angle brackets.

 

[orochi]

Yep, no different than <最強>

 

[Janet Merai]

Why were the brackets used?

This is a flash-back part and it translates to "Stronger!"

 

[orochi]

Probably just to put emphasis.

 

[Damicci]

saikyou
最強
Strongest

 

[The7thSamurai]

Maybe don't think of them as brackets, more like saying *STRONGEST*