AKU is Japanese for "evil or bad" - This is the character worn on the back of my GI. It is not however an endorsement of being a nefarious character. Rather, it served as a reminder to acknowledge that in which we must fight against.
It is inspired by the rebellious/anti authority Kenshin character - Sagara Sanosuke who wore the character on his back in protest against tyranny.
The skull represents NAKAMA being dormant for many years, lost and dwelling in the shadows. It acknowledges how "dead" some think the brand was. It is itself a reminder where we've been and where we are going.
Placed together, it is one of our symbols to the world.